That is a great question!!
I hadn't read that announcement thoroughly enough, merely quick skimmed it. It certainly does say "(ii) holders of record of Neurotrope Common Stock and certain warrants on September 29, 2020 will receive a pro rata distribution of one share of Neurotrope SpinCo’s common stock for each share of Neurotrope Common Stock held or underlying certain warrants held at the close of business on September 29, 2020, contingent upon the consummation of the Mergers."
This seems very unusual to me, considering it is a date well in advance of the shareholder voting. Presumably, I can sell all of my stock right now and still maintain my pro rata shares interest in the spun-off Neurotrope. Frankly, that is attractive to me but I can't do that unless I'm absolutely sure that it will play like this...