I don't think Figaro was alluding to the 'fluidity' of design goals during the developmental process.
Figaro's claim was made in response to
siegecrossbow's post on a 16-tonne variant of WS-10. Specifically, Figaro claims to have read in
2014 about a "significant" revision of WS-15's specifications and that this revision was the reason behind WS-15's delay.
I have not read anything about a "significant" revision, and as an aside, I'm not aware that WS-15 is delayed. This is why I asked him to back up his claim with a source, which he was unable to provide. Your speculation on what Figaro may have based his claim on doesn't fit the bill based on the timeline and the context in which he made the original claim.
Anyway, It's a fool's errand to speculate on and deconstruct logically the process by which a fanboy arrives at his claims, even if he's capable of skillfully regurgitating old information in such a way as to present a false appearance of understanding the material.