Facade paint for house with RAL 7016 windows?

I think is right. However, I also think (or at least it corresponds to my experience) that most people would probably call a color like off-white gray or simply gray "absolute gray." But that would not be anthracite. And absolute anthracite probably doesn't really exist. Technically speaking, gray (C0 M0 Y0 K50) is indeed an absolute gray because it contains no "color hues" and 50% key (black). So exactly the middle of the possible print between nothing and full. Personally, I find that (at least on my monitor at this time of day) gray has a slightly yellowish (so rather warm) tint.

at least on my monitor at this time of day the gray has a slightly yellowish (that is rather warm) tint.

Because you use the yellow filter for this time of day?

Actually not...
Was on the desktop, there I don’t have something like that (Nachtmodus). I only mentioned the TZ because it can also have an influence on color perception...

I also think (or at least it corresponds to my experience) that most people would probably describe a color like off-white gray or just gray as "absolute gray." [...] And technically speaking, gray (C0 M0 Y0 K50) is indeed an absolute gray, as it contains no "color tones" and 50% key (black). So exactly the midpoint of the possible printing between nothing and full.

More than most – namely all – people can perceive color. Even so-called red-green colorblind people have – just "calibrated differently" – rods for color vision, and none solely for brightness vision. The same applies to color monitors:

Personally, I find that (at least on my monitor at this time of day) the gray has a slightly yellowish (i.e., rather warm) tint.

Only a black-and-white monitor can theoretically* "send" pure gray; a color monitor has only Red (= inverse cyan), Green (= inverse magenta), and Blue (= inverse yellow) available. The calibration of these three monitor color elements also interacts with the color temperature of the current ambient light; depending on the location of the interference, a "cast" appears in one direction, another, or a third.
* with a black-and-white monitor, we would be at the next gaming level of the philosophical color purity dispute: which set of lux, lumens, and candela at which mains frequency would yield the one and only true white ;-)

But that would not be anthracite. And absolute anthracite probably doesn’t really exist.

Anthracite can certainly also be standardized as a Pantone color – its approximations in CMYK/RGB are a slightly less greenish than blueish dark gray, so from a "just" balanced gray (= dark gray) perspective, actually slightly turquoise-blue casted ;-)
(mind you, as a powder coating pigment I know it without such a cast).

Personally, I find that (at least on my monitor at this time of day) the gray has a slightly yellowish (therefore rather warm) tint.

You can forget about display on the monitor for such comparisons. It simply depends too much on the hardware what you end up seeing. There are special monitors for graphic designers that provide more consistent results. Even then, you still have the problem with the different color schemes (RGB vs CMYK vs ...), which can lead to a completely different impression for theoretically the same color.

There are special monitors for graphic designers that provide a more consistent result. However, you still have the problem with the different color schemes (RGB vs CMYK vs ...), which can lead to a completely different impression despite theoretically being the same color.

Graphic designers today mostly work for print and online, and therefore deal with both notations for a (mixed) color. RGB and CMYK are not different color schemes, but subtractive/additive counterparts to each other (which is why I referred to Red as inverseCyan, Green as inverseMagenta, and Blue as inverseYellow); blacK is created where C, M, and Y are printed on top of each other: 90C+60M+90Y(+0K) is thus the same as 30C+0M+30Y+60K. For easier understanding, also expressed "decimal," the same tone would be 10R+40G+10B.

Referring to an anthracite #293133 (decimal: 41R,49G,51B) = 84C+81M+80Y+0K this means after extraction 4C+1M+0K+80K, that we are dealing with a 4% C and 1% M (thus slightly bluish-turquoise) tint of an 80% gray.