Would love to know if anyone who officially took the class later found success as an online poker pro.
It sounds like the course introduces concepts that would otherwise take a while to learn by yourself (M, implied odds, etc); however, understanding those concepts alone won't make you a winning player. Experience and surrounding yourself with other successful players are the two biggest factors. Most online pros have literally played millions of hands and have other poker friends to discuss strategy with. If you don't have those two things it's very difficult to succeed playing poker professionally.
If anyone can become a pro if they are smart enough and work hard enough is still true, anyone with the same qualities can make even more in the tech sector with way less effort and stress.