Alright, thanks for the information chief! I actually never expected you to take some time out to research about this and back me up lol.
Just wondering, did you perhaps check Mewthree's IP address and match it with PM's?
PS: I've commented the whole explanation behind why Mewthree is Pokemaster himself.
https://pokemondb.net/pokebase/meta/6322/who-was-the-first-user-in-this-site?show=77914#c77914
Would you like to add anything?
Thank you. :)