So obvious that you have precisely zero proof.
I've spent a lot of time with the livery editor in Forza since FM4. You can't import images. What you
can do is create something on a grid, with a bunch of square shapes (the same way people do pixel art), and then blow it up to give the impression of pixelization. The exception to this are the handful of premade logos Turn 10 provides as stickers; those do get quite pixelated when they're blown up. But, as there's no Nic Cage meme in there, that's not really an option.
When you have a consistent history of intentionally misrepresenting information, ignoring facts, and presenting your bias as fact (like a perfect review, as just one example), it sort of does shade your other posts.
So, exactly what people have been doing for literal years in Forza's livery editor. And very much what
@SDSPOWER01 already posted a video of on the last page.
Here's a tip: use your eyes. That'll help.
The curve of the U to the left of the image should be the giveaway. The jaggies there are consistent with custom livery quality levels.