If you can go from zero to SOTA from a web tutorial in anything less than, I don't know, a year, then the field is severely underdeveloped.
But let that be an opportunity: what it really means is that the field is quickly growing and there aren't well-established experts or leaders.
I think someone with a general graduate-level background in most fields of ML or computer science could acquire a working knowledge of the SOTA in a particular associated sub-topic after reading through a half dozen or so research papers and code. That doesn't seem unreasonable or surprising.
This is not the spirit that some of us want to see in HN. Efforts are always appreciated. The field is improving incrementally, in a very fast way.