Valrak explicitly has someone from GW telling him stuff and it's not even up to a debate. I researched it

Like recent Space Wolves
https://www.reddit.com/r/SpaceWolves/comments/1k85bf0/a_roundup_of_leaks_made_by_valrak_as_well_as_an/
Anyone could say that there will be refresh of Space Wolves, because there will obviously be a refresh of everything
But how the hell could he randomly guess that there will be a new 3-man unit with pet wolves following them? How the hell did he know that Logan won't have a sled anymore, but will be explicitly surrounded by 2 wolves? How did he know that explicitly those named characters will get new models and not others like Lukas? How did he guess out of nowhere that new Scouts will have a Priest with them now?
Random guess like this isn't physically possible. He was fed actual info from his source at GW, there is no other option. This isn't just throwing darts at the wall

https://imgur.com/gallery/aeldari-krieg-imperial-knights-leaks-from-valrak-WARooJu
He correctly leaked Eldar second wave of updates down to new Warp Spider Phoenix Lord and Karandras missing. He leaked Krieg (and Catachan) correctly

He was right about Emperor's Children
https://www.reddit.com/r/EmperorsChildren/comments/1ic110x/rumors_and_valrak/
https://www.reddit.com/r/EmperorsChildren/comments/1g3dvyl/valrak_unit_reveal_for_emperors_children_rumour/
He nailed that they will get new unit of master swordsmen, Fulgrim with few faces, Lucius, Noise Marines, and EC themed Legionnaires

He was right about more stuff. Lorefags mocked him for leaking Saturnine Terminators and claimed them being based on Eggminator art is a fanfiction. Turns out they are wrong now. He knew that Sanguinary Guard will now come in 3-man squad and WON'T have wings. He knew that Lion model will explicitly have 4 head options. He was right that Deldar will only get Malys and new Archon this edition, while actual update is in next edition...

It honestly doesn't look good for TW:40k doubters