yeah, their stuff is good! They had a video about Celeste last year that was really fantastic: https://www.youtube.com/watch?v=yorTG9at90g

That stuff is very in-the-weeds on the mechanics of platformers. If you like that video, Itay Keren's article on the history of how cameras work in 2d sidescroller games is one of my favorite pieces on 2d game construction: https://www.gamasutra.com/blogs/ItayKeren/20150511/243083/Sc...