NigelOnDraft -
I suspect there would... it just would have been the Stick Shaker or whatever Stall Warning system(s) were fitted. That is all they were "checking" - or rather, that was the intention of the check which they seemed to wish to perform, but under inappropriate/incorrect circumstances and requirements...
Quite possible but of course, they would not have (or should not have!) benn testing a stick shaker at that altitude. Perhaps they were testing something else. We'll probably never know, because once again, the crew is not around to testify. Sad.