He doesn't know what he is talking about.
No one listens to Cramer but himself and a few uninformed traders. Never have there been so many uniformed sources of noise as concerns the market. Cramer is just noise.
I guess if you are way long and underwater you could be selling some, but even that doesn't make a lot of sense.
An acquirer is getting a chance to buy all the MU they might want in the market at a much lower price than any offer they might make.