I am not saying (in any kind of guaranteed way) that they will disappear before, - but at the same time, I highly doubt that they will stay in the Cloudflare cache for that long.
So this thread is a duplicate of How long do images stay in the CDN once the origin has been removed? where @epic.network already told you that the Cloudflare Community cannot help you with a website that you do not own and control?
Well, - if it is related to the thread above as it seems, then based on this one:
Base on this, and the other things from the other thread, I highly doubt that they’ve told you that the truth, about that they removed the images from their origin servers, assuming that the image requests (and headers) from the other thread is the actual file you’re trying to get removed.
If it isn’t completely gone from their origin servers, AND all internal layers they may eventually have before hitting their storage, Cloudflare will simply request it again, and then cache it again, whenever the next request for the given file comes in to effect.