This site is not reliable at all and I don't think she could sell that much. Specially considering this is a new track, those numbers are heavily inflated. Still going to do very well and break some records nonetheless.
I always knew she'd open up with like 600k. She's a massive digital sales artist. The song is catchy and appeals to people who don't even like Taylor. If Justin can open up with 500k+ i wouldn't be surprised if Taylor does with 650k