What PKMN does on other Wikis is not the concern of this Wiki. If he causes disruption here, then he may be blocked here, but not before. Please don’t bring off-Wiki conflicts here, because we have no stake in them & consider them disruptive. Thank you.
None of that is our concern even if true, unless it should cause problems on the Diep.io Wikia itself (which thus far it has not). You are welcome to contribute to our pages or talk about Diep.io as much as you like, but I must insist that you drop this subject because off-Wiki conflict is disruptive. You can take your concerns to FANDOM Staff if you like, but this Wiki is not the place to discuss it.
You are mistaken. Tier 5 tanks are available to be created by everyone; this page in particular is merely Patrik's own documentation of his own take on Tier 5 tanks and how they function. Not all Tier 5 tanks are under his ownership.