She's endorsed Democrats in past years and encouraged people to vote. They're mostly afraid that she will actually endorse Biden this year, even though she hasn't actually done anything.
I feel like not supporting Trump shouldn’t count as a political statement. Like saying “I don’t want to sexually assault people”. It’s just basic decency.
Generally, she just encourages her fans to vote, and Republicans know young women don't want anything to with them. They really just want to make it so uncomfortable for Swift to say anything, so they're bringing a preemptive firestorm and hoping she keeps her head down this election season.
So I don't know much about her generally, other than she is famous in her own right for her art and business savvy. So my opinion about her has long been uninformed neutral.
But what I see in that video gives me a respect for her that otherwise I wouldn't have. She knows how important a vote is, she is self reflective, she stands up for herself and her own choices, she is obviously informed on issues, and she is compassionate towards others. These things are a good measure of a person.