As a frequent visitor of the Chinese internet myself, I can tell you that is it certainly not the case.
This is especially when no credible PLA watchers on the Chinese side of the internet referred the J-XDS as J-50.
What's being most used instead is Cheng-6 (成6) or South-6 (南6) for J-36, and Shen-6 (沈6) or North-6 (北6) for J-XDS. Admitedly, the J-36 is also often used given that we've already saw the "36011" marking on the J-36, but no such case exists for the J-XDS.
Because the PLA(AF) is already acknowledging it as H-20.
(from minute 5.24)
【空军副司令说神秘轰20快将公布#值得骄傲兴奋-哔哩哔哩】