I am not familiar with the Nation at all. And you are most likely correct in that it is a liberal rag. But some points made in the article are correct. The Twitter rollout was bad from all news sources.
No it wasn't. He overloaded the servers due to incredibly high demand.
He also apparently set the record for the amount of money donated on the first day of a campaign announcement, and it was primarily small donors.
According to reports, DeSantis brought in more on that one day that Trump did for the first 6 weeks of his announcement.
So get real. If that was Trump overloading Twitter, and breaking fundraising records, you'd be declaring the general election over already.