Are stonewars backing it? They are the one who made a whole article on how likely it is, just by reasoning, not facts. I dont know, have they commented on the matter in a more confirming way after that?
https://www.stonewars.de/geruechte/harry-potter-d2c-set-2020/
Stores sometimes list thigns based on rumors so i wouldn't automaticly take that as a leak.
I dont know who jedijacpenguin is, but how clear a statement do we have from him? and where.
If thats clear and trustworty, that'd be all that matters.