an extremely sensitive Chinese military platform but you are picking up an outside over trio and of course he is an expert.. that doesn't make sense.
I'm picking the outsider because he has access to firsthand imagery, how does that not make sense?
if you read the first ever article of navalnews. they clearly stated a small sail does appeared but it is not the traditional sail usually on all submarines. and sailless doesn't mean completely flat surface. it does have small sail. if i remmeber correctly Para80 also told about small sail on submarine.
Its latest design, a distinctive and innovative vessel that dispenses with the traditional sail
The original article obviously suggested it was just a bump like the original JN "sailless" submarine, the new article now say it basically have a traditional sail except its somewhat smaller and thinner, from the illustration it seems like it would be similar to Virigina's thin sail idea like Xiyazhou mentioned. Quite a big difference from "thin sail" to tiny (relatively) bump if you ask me.
and yeah it maybe not the super weapon but this is definitely a new class of advanced submarine for special purpose with a completely new and distinctive design.
You are basically agreeing to throwing out Xiyazhou's idea of next generation SSN here, nowhere did I mention that it would not be advanced. But the reality is basically all of Xiyazhou's analysis is based on the sole fact that the design is sailless, he literally spent two articles on how the sailless design mean the submarine have an extremely high silent cruise speed and how everyone was trying to do it because it was the holy grail of SSN design, in fact probably 95 percent of his argument on this being the next generation submarine is due to its special configuration. Same with the trio's inference of expected performance of the new submarine in their podcast last week.
tl;dr: Advanced, very likely but not new or distinctive of a design as everyone made it out to be initially and actual performance is also likely lower than what they were implying.