If people seriously believe that Blizzard are going to go through alpha and beta in two months time in the middle of covid you're complely delusional. It's Blizzard, they have PTR testing up longer than that for .5 patches.
Even if TBC was ready for testing tomorrow it would be at least 4 months of testing in multiple waves. Blizzard still have some sense of quality left, they won't launch broken untested crap.