They will not show it because even the shape and size will give away too much detail. So something like HGV interceptors or BMD missiles they will not show at all unless it is at least one generation old i.e. there is something that has already replaced it as the "latest" and new concepts and ideas already being worked on or tested. Whatever they show that is strategic in nature is already two generations older than what they are working on currently.
If you notice this pattern, the DF-41 still has not been shown. US won't show the HGV inside the AGM-183 aka ARRW. China revealed the DF-17's HGV because China needed a deterrent. You don't want to reveal so much that it erodes your advantages and gives too much information yet you also do not want the enemy to think too low of you in case he misunderstands a situation and stumbles into war which you do not desire either. It is why in this era of China being much closer to the US than it ever has, is China beginning to be relatively more transparent than it has been in the past. China has never been too much of a slouch in tech and military hardware to be honest. It's been behind and has had ambitious projects it ended up cancelling or not meeting expectations due to lower development of industry in the past but it still always had respect for science and tech while trying to maintain a place in those fields despite the struggles of that era. It still explored flying machines before many nations despite being one of the poorest. It still launched a satellite and built computers on its own when many nations were far more developed and wealthy.
Naval warfare is still the most secretive out of all of PLA. Apart from stuff you can't hide like building new carriers and what new equipment on ships look like on the outside, we actually don't know too much about weapons. They won't show AShBM like DF-21 or DF-26, definitely not a look at the MaRV. So there is stuff you can't hide at all and stuff you actually have shown off. In that latter list it really is just GJ-11, WZ-8, and DF-17 HGV. Maybe include AShBM operation in that list since the US would have collected some flight path data on them when they were used in demonstration.
I would compare the strategic importance and value of secrecy of HQ-19/26/29 etc as much greater than showing just the size and geometry of GJ-11 or WZ-8. China wanted the US to know that it has a few A2AD equipment beyond whispers of AShBM which have proven to be real and can somehow be guided and maneuver contrary to what many armchair skeptics thought.
China has a habit of usually revealing or announcing things that they have already done and in service. This goes for the vast majority of projects. Contrast to some who talk, make models, and show powerpoint slides while patting themselves on the back. With China, since it has such a formidable adversary, whatever is shown is only revealed because it needs to be for some reason.
