I did not mention .local, because it is covered in the linked articles: a special-use TLD, reserved for a certain purpose. It has often happened that LAN admins try to name something under ".local" and configure a zone for it in their BIND server. But this is incorrect, because ".local" is already managed by the zeroconf/mDNS protocols. It is a special case; and that is what ".internal" seeks to rectify, by giving y'all a TLD that can be truly internal and truly a zone under DNS server control, whatever that looks like for you.

As for 127.0.0.0/8 in the public DNS: https://utcc.utoronto.ca/~cks/space/blog/sysadmin/HowNotToDo...

As for localnet and localhost in general:

https://utcc.utoronto.ca/~cks/space/blog/sysadmin/LocalhostI...

https://utcc.utoronto.ca/~cks/space/blog/web/LocalhostSurpri...

".vibe" is not a TLD. It is not a registered TLD; it is not a reserved name. It isn't a domain at all. Go ahead, do a WHOIS lookup. Anyone who attempts to use such gibberish, even in documentation, deserves to be rudely surprised, someday in the future.