>>egorfi+(OP)
The requirement in the contract is nowhere near that specific. Contact info validation is sufficient for almost all registrars. It's possible a given registry has higher standards, or maybe one registrar got some order to be more thorough, but great reason to avoid given this is a commodity and there are actually good alternatives. (I broadly like Tucows and Cloudflare)
Namecheap is on my NO NO NO list, along with GoDaddy (and a bunch of others). Google Domains was also on this OH GOD NO list, but thankfully Google did the Google thing and killed the product.