I am in the same boat with MSC. I filed i-751for my wife on May 04 2020. Received NOA and 18 months extension in June 2020 . Since then we did not hear anything from USCIS. No Biometrics !!!
This is sad as i live in florida and wanted to move to texas ,my case look buried with them,which state u file from?keep me posted if u have any good news
Yes you are right and this is what is what i was told,and local office will have to interview u after they set up the interview,we are in a wrong center with the MSC..only God will speed up the processes