To Bear, dkatsaris, and the rest of the "pro-host" crowd here:
Pro host? Simply applying logic.
Under GDPR and International Data Privacy standards, when a user requests account termination and data deletion, the provider is OBLIGATED to purge all associated records.
If it's linked to you directly. The DNS zone is not that. If this is about GDPR, why go to the .mx registry about it, and instead file a GDPR complaint?
they are effectively polluting their own IP space (198.91.80.155) with dead configurations.
And? It's theirs, to do with as they see fit.
I have the right to report the mismanagement of .MX resources.
This one domain is theirs to use. If they have one or a hundred subdomains, that's up to them. The .mx registry, as far as I know, doesn't regulate internal use of a single domain.
This means their automation script is broken.
That implies you know for a fact there is a script to remove subdomains automatically. I venture to say there isn't, at least not immediately. Again, odds on favorite it's to prevent the removed abuser (assuming) from simply making a new account with that subdomain.
I am not asking for your permission to complain.
No one suggested permission until just now. And us responding is equally allowed here, even if some disagree with you. That's the nature of "discussion".