Dunno if you'll see this but - when you read a "Russian" name with T at the start, as the name used in the video - Tsechenko or whatever - the T is effectively silent. It's hard to read but basically we don't have an equivalent sound in our alphabet, and the sound itself is not really audible to us English native speakers so, just treat it as silent. Tischenko is certainly not correct and a butchered form of the name, so badly that "Russian" native speakers might not even understand the name at all.