I don't know this guy, but it's free, so I don't think it's a bad idea, and being online, you can always get out easily if you decide it's not worth.

Regardless, there's tons of online content in game design and development in general. If you want videos, you can check the GDC channel on Youtube, for industry talks in various topics. Also, many channels have good content, such as Game Makers Toolkit, AI in Games and so on. And online platforms like Udemy and Coursera have relatively cheap courses to get started.