Window interior sealing with sealing tape

You have an expert. What are you paying them for if you have to ask about the appropriate remedial work in an internet forum?

The expert’s opinion is rather that he evaluates the execution according to the state of the art. Finding a solution is the trade’s responsibility, which messed it up.
He simply wasn’t sure whether it can be reworked like this. Scraping away foam and applying a second layer came from him as a basis for discussion for the window installer.

I know it like this:
Stick sealing tape on the frame, there it is self-adhesive. Then a thick bead is applied to the reveal, e.g. adhesive from Illbruck, and the sealing tape is pressed in. If you have ever held such a cartridge in your hand, you can already see from the nozzle that a thick layer of adhesive must be applied, this has nothing to do with those 3mm openings known from silicone.

Masonry is not a 100% even surface, how should self-adhesive tape ever become airtight there? At best it compensates 0.1mm, if at all.

But the sealing tape is definitely self-adhesive also in the reveal area. It is the Greenteq Plena Top, which also has adhesive "reveal surfaces".

I hope the inventor had a reason for this … but I don’t know it well enough.

Foam has nothing to do there.

You mean in this reveal area, correct. Yes, I see it that way too.
Is the excess foam normally cut off beforehand or can others dose better when foaming?