Would highly recommend. I feel like Grant's videos gave me a better understanding of Linear Algebra than the course I took in college.
For subjects I've already learned however they can be useful for gaining new visual perspectives.
On the topic of learning rotation matrices / linear algebra in video games, I'd strongly recommend the Handmade Hero youtube channel. Casey explains these subjects at length in multiple videos, using plain chalkboard-style drawings I personally find far less distracting.
To expand a bit more, I usually don't enjoy resources that emphasize how "practical" they are, because I almost never "learn" anything from them. They teach procedures, not concepts.
This course, and fast.ai's other courses, are different in that they still approach the subject matter in ways that feel tangible and "real world," but they are doing so in a way that reveals and helps you learn the underlying concepts—it's just done in a top-down manner.
YMMV of course, this has just been my experience.