Yes it did


You would also have to reconcile the fact that Hyou says it’s something they teach all samurai. Given that we’ve seen Momo train to be a samurai as a kid, and that Zoro learned about it as a kid, we can assume that the begin teaching that principle to kids at a young age. Which would mean that every kid and low scrub in Wano would have haki, which isn’t true.
So no, it wasn’t a retcon, and no, BoAT is not haki. It’s just something fanboys claimed to overrate their favorite character, unsurprising given the source.