So here is the update.
I e-mailed EBretro but did not get any answer. I also tried customer service but they could not do anything (phone and chat).
Turned out however that the points registered Tuesday evening (so between 24 and 26 hours after the last of the four flights). Status in app and online was changed to Gold immediately. I have checked in for the flights tomorrow and the boarding passes are in Group A so all is good for fast track and lounge.
Thanks for your input again.