This is one of the common tropes in Sora the Troll’s videos on non-native Japanese speakers. The subjects only consume anime, so they end up duplicating that way of speaking; but anime, like most Japanese entertainment, is like… Old school theatre? It’s purposely exaggerated and over-the-top, so talking like that IRL is just weird. What makes it extra funny is that the skits are also over-exaggerated and over-the-top, so they also sound like anime. lol