As an interviewee I'd take this as a very good sign that the company is serious about offering me a long term position. If I'm living on the west coast and my employer is on the east coast and my contract says 100% remote I'd seriously doubt the company is trying to fool me by wanting to meet me for one day, on their own dime, without further interviews.
There's a difference between trusting remote employees and aspiring employees.
I wouldn't hold it against the company if they want to do proper due diligence on a prospective employee especially given real-world accounts of such frauds occurring.
Why should an aspiring employee trust that a company is going to allow 100% remote if the first thing the company expects you to do is to travel into the office?
1. completely or entirely
It absolutely does mean zero travel.
Are they? I've been recently contacted for remote positions that turned out to be not remote twice.