I believe the corresponding tightness inside can still be achieved this way. If the reveal plates are in the APU strips (in the strips, behind the reveal plates there is a swelling sealing tape), the connections on the left, right, and top should be fine. The connection downwards to the already glued sealing tape from the side of the reveal plates must then be carefully executed with suitable sealing tape.
It would be good if there are no cavities later directly at the windows (between the reveal and reveal plates / window), as this is exactly where condensing water would form.
Currently, I would worry more about the fastening. Try unscrewing a screw. It looks to me like some long Spax screw that has been screwed into the stone. And it has already been said that it’s a stupid idea to screw a screw into EPS/Styrodur. As usual, “real experts” at work with the brain left at home especially for the job :mad:
We can’t see the fastening at the bottom.