“Audiences in Russia will also be shown footage of Mariupol Russians rejoicing at having Russian troops in their city, it continued.”
Have you ever heard of a Potemkin Village?
https://energy-cities.eu/members/city-of-mariupol/
“The city is largely and traditionally Russophone, while ethnically the population is divided about evenly between Russians and Ukrainians.”
Showing Russians in Mariupol is like showing fish in the sea. They kind of go together.