As others have said, it would imply they've seen J-XD in some form and are confident enough that they've seen the actual article to make a remark about its aesthetics.
If this thing really does emerge later this year as a prototype or a genuinely representative tech demonstrator, then I must say it would be a bit of a shock. Sure, over the last year or so we've had hints that maybe J-XD is a bit further ahead than we otherwise may have thought, but if an actual representative tech demonstrator emerges (or even just has its existence significantly hinted/rumoured at), then this would be a bit of a step ahead of other next gen/6th gen projects in the rest of the world including the US.
In fact, given the US seems to be going back to the drawing board even in terms of requirements for NGAD, if J-XD does appear to a "genuine next generation/6th generation" airframe this has the potential to be momentous.
.... and I echo what
@ACuriousPLAFan wrote: imo we should not spread these very early pre-rumours about "expecting J-XD" this year on twitter or reddit etc, because the sheer scale of such a call is one that is hard to dial back and without confident confirmation it's not something we can confirm or be helpful to the discourse.