Yes; but if he's doing everything by himself you could assume he would be getting at least one of these steps right
Instead maybe he got good at reviewing, but that goes back to my original point. Being good at reviewing is not the same as being good at creating stuff. If I'm not mistaken, he also got involved in a movie, but it didn't take off either. It's a bit sad in a way, people like that trying their hardest to create something but having to go back to just reviewing other people's stuff.
I knew someone who got on the Bad Webcomics Wiki. Most everything was true about how Mary Sue and Gary Stu everything was, but I still give the maker of the series props because it was quite literally a test manga to practice getting better at art-ing.
Well, as long as the review is actually constructive and not just a bunch of "sucks sucks sucks look at this bahahaha so much suck!" than yes, I think every artist should be able to get reviews of their comics so that they can consider if making a change to their comic would be helpful.