>>3The probably teach you how to use RPG Maker and Unity, which is not going to teach you general computer science and software development concepts.
Actually, if you watched the video, he complains it was the opposite: they taught him math and C#, instead of teaching Unity and RPG Maker, and how to draw sprites in Photoshop. So in the end he had these lowly math skills and a huge debt, knowing nothing about making a game. TLDR: mathematics is a scam.