The content on the Pokegym pertaining to scans are from the official pokemon OP website. Content that is OFFICIALLY released from OP are put into the home page here. It's not like this site is putting up illegal/unofficial scans like some other sites have. Either way, I have no problem with scans.
I always like to know what is coming out, and if I want to see "unofficial" scans, I will also look elsewhere for them. No big deal. The content in the front page is like a mere tv advertisement/commercial. Since I don't like commercials on TV since they are extremely annoying, I do not watch them. So....
If you don't like the content, knowing that before a pre-release such spoilers will be released, then don't look at them, the topics, or the threads! Simple as that! If anything, I wish they put up more scans here for me to see. It's not like seeing 2 scans has ruined your life or anything.... Sheesh!