100M is quite low if he claims to use advanced techniques to harvest alpha. I've seen beta funds managing much more money...
But I guess he must be frustrated with the avg redditer.
I think his mistake was thinking he can go on reddit and find some neckbeard giving away a new source of alpha. So he is frustrated because he's probably not performing and is getting called out for it.
I don't even know what's "ML" so it's definitely not me. LOL To me, I can never understand why a software engineer who's already making six figures and has pretty much guaranteed jobs anywhere he/she goes would want to give up all for a career that has not only non-guaranteed income but guaranteed losses for unpredictable x amount of years especially if you have family and responsibilities.