Isn't this mentality kind of immature and borderline selfish at this point?
No, considering some of the accusations made by their webmaster and other things that happened, this is actually closer to self protection. We are, as senior staff team, currently safer and better off not acknowledging that site or allowing further mention of it.
(we know of at least one major privacy violation towards our site that I won't discuss further for... well, privacy reasons, but pushed a lot of it over the edge)
It hinders the community in its own way, especially since we all acknowledge that this website is nowhere near as complete as SPP.
And plenty of other sites tend to do it better. For new game news, for example, Pokebeach tends to be superior in their news offerings
To add to that, I think most people in this fandom have an incredibly low view of their webmaster so I can tell you now that linking to SPP doesn't mean supporting the webmaster's actions.
Then go to one of the other sites that offer more complete and accurate information.