That was not the claim. The claim is that a bumble bee cannot fly using stiff wings. Bumble bee wings are flexible. One can also show that a bumble bee cannot glide. (The true stories are actually more interesting.)
don't think "they" ever said they had proved a bee couldn't fly, just that the model they were using couldn't account for it- more recently, IIRC, "they" have figured out that flapping insects use their wings to create vortices, and sort of "surf" on them, as opposed to birds, which apprently use the reaction force of the air their wings accelerate to provide lift/thrust. Then again, I may have that entirely wrong.
Then they never saw my ex wife hurling a can of tuna in my direction.