It's pretty much impossible to get any accurate reports from either Russia or Ukraine. The warthog YouTube page is just propaganda. Russia had 600 T-90 tanks in inventory when the Ukraine conflict began. From what I've read they only sent 50 to Ukraine. Russia also has a large inventory of upgraded T-62 and T-72 tanks.

Russia has been producing enough tanks that they've been offering them for sale for many years. In fact, Russia is second only to the U.S.A. in arms exports.