Anyhow a couple years later I got called by a recruiter from Amazon asking me if I'd be willing to relocate to work there.
FWIW I think it's because recruiters at most companies are effectively contractors and don't have access to all history of communications.
The barrier of entry to become a receruiter in general is very, very low.
Many, many years ago I sat next to HR in an open plan office while on a freelance gig.
They treated almost all candidates like subhumans, both when talking about the candidates within the team and when speaking on the phone to candidates.
They handled everyone from factory worker and janitorial roles, to specialists to director level. I very clearly got the impression that they only treated candidates well if those candidates could turn into people who had any power over them within the org.
I've carried that with me since and I often recognize it in HR staff I interact with now.
He called me to discuss my experience, one of which mentioned that I worked in an environment where my team managed "30,000+ servers". He took the opportunity to say something along the lines of "that's irrelevant, that's smaller than one datacenter in one of our regions".
I honestly have no idea why the recruiters from these places have such a superiority complex that they need to belittle people like that. It's not even the manager of the team you'd be working on, just some recruiter that probably doesn't have any of the skills/background the job they're recruiting for requires. Yet they need to make you feel small and worthless right out of the gate.
Is it just prepping you for how you'll be treated there? Trying to select for people that are okay with being belittled?