Floating washbasin cabinet on drywall partition wall?

We purchased a new apartment still under construction, although the construction was already well advanced at the time of purchase. In the bathroom, the developer had planned a washbasin with a floor-standing base cabinet.

Now, as a layperson, I am wondering whether a furniture washbasin with a "floating" vanity cabinet (60cm) could alternatively be mounted on the pictured wall or the protrusion (see image) where the washbasin would be placed?

A Geberit mounting element was installed in the protrusion, where the original washbasin would have been attached. Can this also support the furniture washbasin and vanity cabinet, or would the wall protrusion have needed to be prepared differently from the outset? In the additional offer, the sanitary company only stated that "no additional preparations for mounting were made, as the choice of vanity cabinet was only made after the rough installation. Therefore, the cabinet will be mounted on drywall." I am now wondering whether this is even possible, and whether it would be secure/stable?

I am now wondering whether this is even possible or if it would then be safe/stable?

Basically, that is not a problem

Basically, that’s not a problem

Thanks. But just to be sure, let me ask differently: even without tearing down the wall projection again? ;-)

That can definitely be done. Either use the existing fasteners or use anchors for drywall. Or both. I also glued it additionally.

But just to be sure, asked differently: even without tearing out the wall recess again? ;-)

Yes. Normally, the washbasin is attached "normally" (but please buy it as a countertop washbasin) and the cabinet underneath is mounted with suitable plugs for drywall.

We implemented this with toggle bolts. That holds.