Hide it from
https://gbatemp.net/forums/ ?
Does one forum really trouble your carry on scrolling thing? If you can live without the subcategory it is in you can collapse it.
Really though just the one that so bothers? I can sort of maybe distantly understand new threads if it is every other thread but eh.
If you are viewing the forums via
https://gbatemp.net/new/ , which is the superior method of viewing new content at present anyway, then
https://gbatemp.net/account/new-content should be able to whitelist/blacklist depending upon your preference.
That said you could probably add it to your adblock settings as each sub forum has its own individual class by the looks of things that should be enough to use for a unique key right from the start rather than something more complicated using the forum name (which is bound to be unique unless someone makes a group called that or maybe has it in a post title).