The real source is a German news site called "Tag24 News." Why did you link to an MSN reprint of it?
In any event, Jill Stein is almost certainly a Russian asset, and the American version of the Green Party bears little resemblance to the European Greens, both in policy positions and credibility. Ellison has every right to express his opinions about them.
Someone should explain to those Muslims in Wisconsin that Stein literally cannot win their state. She has no electors. State law requires that a candidates electors be nominated by state office holders. The greens have no state office holders so they cannot nominate any electors. Even if Stein were to somehow win the state, she can't get the electoral votes for Wisconsin. All she can do is again steal enough votes from Harris to give the election to Trump.