Hmm. What ISPs do this? Perhaps institutions like universities?
Having to spend time verifying every alleged false positive would be expensive, and doing it for anyone that asks would undermine the security of their offering. I suppose they could temporarily delete if and see if it gets flagged as risky again.
I’d be intrigued to hear more information about this person’s ISP, location, etc.
He clearly states "I don’t have the ability to change my IP with my ISP so that’s not an option".