From what I can tell, comparing the two images myself, it’s heavy referencing and not direct tracing. There are inconsistencies between the two; the “overlay” version is just too messy to tell. Besides, why would he bother tracing if all he’s going to get is the essentials of the pose, and not the details, when he’s been proven to just reference poses before?
Also, he fessed up on DeviantART that he used the image in question as “heavy inspiration”. Hell, if you look in the description, he calls her “Yoko Rarity” and refers to the image as a crossover. He did the very same thing with a few other anthro drawings, surely with referenced poses that you could find if you put the time in.
His art style in other pieces, particularly involving ponies, is consistent and his own, very clearly not traced. The vast majority of his work is not traced. I think it’s fair to say 99.9% of his future pieces will not be traced. If you want actual proof of him reliably and directly tracing, perhaps you should watch when he literally streams himself working to an audience. Feels like the “nothing to hide” mentality is pretty fair, huh?
There goes all your reasons to be upset about him, really. Unless you’re just salty that, at face value, he appears to have traced and want to ruin him by having HN or EQD make posts about him and have him harassed by tons of people. Because muh mob mentality.