it seems weird to count "enthusiastic, uncompensated endorsement from satisfied customers" as "marketing"; maybe it is technically marketing, but it carries none of the negative connotation your comment seems to imply
This guy consistently hates on people who suggest fast.ai as a resource, without giving any reasoning.
I've done Andrew Ng's Coursera specialization (deeplearning.ai) and course.fast.ai, and I would 100% recommend starting with fast.ai. (Seeing results more quickly is motivating. It's also free.) When you know that you enjoy the topic, feel free to learn more rigorous ML theory from other sources.