I think you may have misread the title (and certainly not watch the video! :P). This is about games made in Godot, an open source game engine (mostly written in C++) featuring a scripting language similar to Python (but far from identical).
I'm using GDScript myself so don't take this as an endorsement of these, but Godot lets people build bindings for just about any language. I mean, it'll limit your options for technical help and limit your options for platforms in some cases but you can do it. Also you're reliant on yourself or the project maintainer to keep the bindings in 1:1, even the C# which is officially supported isn't completely 1:1. You can also mix and match as you please, implementing more demanding things in C++ or Go or Rust and others in other languages.