Not him nor will I talk about his course, but I’ve been in the field a reasonable amount of time (both on the academia and industry side). Honestly, applied maths will get you a long way and make it easier to digest the concepts (you might just see them as repackaged problems depending on your mileage). If you have good programming skills and discipline you practically have most of what you need.

Re the course, I just skimmed it and I think you can do most things on your own hardware but if you will actually use this for something practical (not just for you or a side project), being familiar with cloud tools is a big thing especially once you scale.