We know? Now I‘m surprised and maybe I‘m getting old and forgettable but even if there are indeed rumours, I don‘t remember any hard proof or confirmation for this ALCM, even lesser an image or model?!
Or do we have written confirmation in documents? And if yes, could you please help to post them?
This is from like 2020 or even late 2010s I believe, from pb I believe which was posted in one of the threads here, for a 500kg class ALCM/AShM.
"We know" it exists in the same sense that "we know" the 3-5 quad pack MR SAM for UVLS exists -- i.e.: no documentation, no model, no definitive specs or full form factor, but that its "mission set" is fulfilled by a product that exists.
For the purposes of discussion, if I was to write about it among "skeptics" I would likely phrase it as: "There have been longstanding indicators that a 500kg class stand off multirole cruise missile exists for use in J-20/J-35 ventral internal weapons bays, however such a weapon has yet to be revealed or publicly disclosed."
For the purposes of our discussion on SDF, I am surprised that you do not recall this weapon being discussed.
To be fair it isn't that important because it's "only" a 500kg IWB cruise missile, so its effects and strategic significance are somewhat limited.
The problem with PLA missiles carried "internally" (whether it's IWB or in VLS cells) is that they can often be tested in relative obscurity and can enter service with next to no confirmation to us in the public apart from errant rumours that are brought up or referenced once every few years. PL-16 (until recently), the 3-5 quad pack MR SAM, and this IWB ALCM for J-20/35 are examples of it.