bitterproffit there are two museums with similar names
I’ve went to the one at Olympic Park - the one you linked to - a couple of years ago.
Small and a bit disorganised but interesting nonetheless. Looked like a couple of portacabins stuck together and badly signposted.
I discovered it by accident simply because of the S/U Bahn route I chose to get to the Stadium !
It’s totally different from the Allied museum at Tempelhof.
Thanks for the suggestion about the memorial ar Treptow. Also added to my list of things to do now!