If you know anything about the Soviet Union and its history of propaganda, you already realize this wasn’t filmed within 1,000 miles of Mariupol.
Yes, it might have been.
I've seen other reports on Russian reconstruction in Mariupol, so something is happening there.
However, in 2021, Mariupol's population was circa 425,000 and today is down to around 120,000.
The others were killed or fled or were kidnapped into Russia.
This may give a sense of what's going on there now: