I bet they arn't even sure as at this point it basically proves they just started to do longevity test for 13 and 14 gen recently, those affected and not affected SKU list is very likely BS/ educated guess when pressed by the management and PR team, something like this:HX series might be impacted due to them being full desktop dies (it's a 13900k binned for efficiency). However this of course depends on implementation, there have been reports of 13/14 HX series experiencing degradation already.
Boss: you have to quickly give me a list of dying and safe SKU list
Engineer: Er... but we only just started to test and investigate the dead samples..
Boss: I don't F care, give me a list by end of tomorrow with some reason of the trouble
Enginner: er... still not sure, but likely excessive voltage
Boss: so give the line of safety, NOW
Engineer: hum~ from the VR curve and VID table likely the i5 and above with 65W+ rating is surely affected, the rest will still need to be proved and investigated..
Boss: Enough, we will just say everything below 13th gen i5 is safe.
Sure this is a evil joke with sarcasm. But in real life if one works in any profession, very likely you'll be facing something more or less similar, and ended up unsurprisingly be a pool of S, when the whole RPL is likely a desperate move to release to be competative without proper validation through management pressure, it would be too surprised that those ensuring messages are an even more desperate effort of damage control with less proven fact than it sounds to be