Katslf
to get out of a stall caused by a false overspeed reading from a huge updraft
Airspeed fluctuations caused by windshear are REAL, not false, and have to be dealt with in the normal manner. The aircraft flies by air, not by ground.
However, because this aircraft was lower than they wanted to be, it is reasonably certain that the windshear would not cause an overspeed. If you are 4,000ft below optimum, the buffet margins should be wide enough to cope with everything bar disappearing into the center of a CB, and we can be fairly sure they were not doing that.