Maybe, but I wasn't really big into PLA watching at the time and the same conduits for information didn't really exist back then when things like BVR and AEWC were introduced to compare.
That said I'm sure that having had time to assess 5th gen fighters themselves would've altered some of their procurement plans at least. I would have been interested to know what their plans for acquiring 5th gen fighters would've been prior to assess J-20 and how much it has or may continue to change in the immediate future. E.g.: will they build more J-20s than previously projected, will they accelerate a medium weight 5th gen project etc.
Also interesting will be how it impacts AEW&C and ISR platforms. I'm of the belief that future AEW&C and ISR platforms will be very distributed in nature i.e.: among multiple low observable and very low observable UAVs operating in a forward manner with large manned traditional platforms operating much further back.
Distributed AEW, EW, and ISR is precisely what I’m thinking when I think HALE UAVs greatly expanding on current AEW capabilities. If you get a whole network of long endurance high altitude UAVs acting as sensor nodes in a wide ranging distributed network not only will you be able to greatly expand your resolution, range, and tracking power, but you’d dramatically increase persistence and resilience. Each node could use lower power radar to avoid lighting up passive sensors as getting longer range won’t require more powerful transmission from a single array, and taking down one node wouldn’t only fail to take down long range sensing and tracking capability but could actually allow the rest of the network to interpolate the location of the aggressor much more quickly and confidently. You would need a greater number of sorties for the larger number of planes, but these smaller sorties would be much quicker and more responsive, and the logistical burden of each sortie would be much smaller than with a large AEW plane. You’d also be able to cut down the burdens on manpower needed to operate this capability, especially as AI automation matures. I’m highly skeptical that current AEWs present sufficient threat to stealth capabilities, but if there is a scenario where stealth can be sufficiently neutralized my thinking is that it would actually be with distributed HALE UAVs. This is all off topic though.
Specifically bringing back discussion to the J-20, I’m also interested in seeing whether these recent exercises change thinking about procurement, but perhaps tentativeness on the original procurement plan for 5th generation fighters is precisely why the J-31 hasn’t been canned just yet. If this is right, then perhaps we should be expecting the J-31 to be picked up by the PLAAF.
Edit: Also, just figured out the word I wanted to use when I argue the J-20’s induction process may turn out to be more significant than with other new platforms from the past. The word is “transformative”. That doesn’t mean precious new platforms were, but this one may be more so at the deeper roots than others.