Frankly, if that is really the case, then I have to say that's pathetic. I never would have figured SL for a content drought expansion. They assured us time and again that the pandemic wasn't noticeably affecting their production, especially as its digital and can easily be worked at from home.
Shadowlands is now fully 2 months old and there hasn't even been a shred of info on a 9.1 PTR, let alone an actual release. Legion had its 7.1 "Karazhan" patch released to the live servers less than 2 months after launch, so we are now on track for mirroring BfA's godawful release schedule and seeing the .1 patch approximately 4 months after expansion release.
I feel that mass unsubs are just on the horizon.