They can not donate to a political action group. Is this news to you?
Quite correct, they cannot, no, not news.
The Spotsfish fund is not tied to a political action group.
Also quite correct, it is a 501(c)3 organization and can quite readily sign the MOU.
The "largest donator" cannot sign the MOU in its present form. They are not a 501(c)3 organization. They can and still do donate to the Sportfish Fund, which is.