Apparently nobody on this thread, nor the author, reads the Constitution. The Constitution says nothing about the party nomination process — only the election itself. See the 12th Amendment for more, or more details here — https://billofrightsinstitute.org/educate/educator-resources/lessons-plans/current-events/nomination-process/
Also — all seven of these “points” seem to cover effectively the same premise — that the Dems believe (as they should) that the party nomination process is not subject to US legal jurisdiction. These points touch on various aspects of that same point. Now, of course, you can say the Dems’ obfuscation of this seems a bit circumspect, with which I would agree, but remember not so long ago when the Repubs were thinking of blocking Trump’s nomination even though it was readily apparent that he won the people’s vote?
This is way overblown.