Easily. I wouldn't put it past Putin to bus in the crowd from Russia just for this specific occasion. They've been doing it for years, why not again?
Just like they film Putin's meetups with "factory workers" or "wounded soldiers". If you follow the news for long enough, the faces of those "soldiers", "workers", and "miners" start repeating.
They've been doing it a lot pre-war. When protests erupted and were crushed in Moscow and in major Russian cities Putin's media scrambled to show that "regular hard working people oppose gay rich Muscovite hipsters who sold their country".
A hilarious example was when they even staged a "worker" from Uralvagonzavod (a major tank factory) before Putin who promised to "gather guys and show them"[1]. Of course PR director for the factory was a famous Putin's media manager Alexey Zharich.
They staged tons of provocations at protests to film it and show on repeat on TV.
RT and Russian state media used the same tactics after 2014 occupation.
While staged and fake this propaganda works if you show it 24/7 on TV. We were shoved it down our throats for years and now they feed it to the West.
Just like they film Putin's meetups with "factory workers" or "wounded soldiers". If you follow the news for long enough, the faces of those "soldiers", "workers", and "miners" start repeating.