This. He communicated his plan pretty overtly: He made no secret that his buy attempt is mostly for political reasons and that his selloff will be a means to the end of securing funding for the takeover. None of this has anything to do with actual investment decisions.

So maybe he hopes to sell his shares to "activist buyers" who want the takeover to succeed and therefore have no interest in dropping the share price.

Of course that is assuming any of the purported motives are real and not just an act.