Modern EVs with thermal management simply haven't been around for long enough for a significant quantity to reach 1 million miles, especially those with LFP cells.
There are some taxis and limo service Teslas that famously did make it to 300-400k+ miles on their original pack.
A theoretical battery that is not actively produced, let alone actually gone the distance…?
On the other side I can tell you at least SaaB has had a million mile ICE car, from 1989. There’s assuredly more than this.
> 1989 Saab 900 SPG - 1 Million Miles
https://www.saabplanet.com/1989-saab-900-spg-with-1-million-...