Worth a try but I’ve tried doing this before and they said it’s outside the scope of paid support.

Yet it's not outside of the Law. At least in Europe, they MUST give all your data back.

Assuming you mean the GDPR, it only obligates them to share the data they have. If their response is "we don't have that data any more", then the GDPR won't help you.

It opens them up for a massive claim if it later turns out that they really did have the data somewhere, though.

The "we don't have that data any more" should only apply to "I closed my account" not to the "we unilaterally chose to close you're account and delete all your data just because we can". And if they jumped the gun and can't, they must pay for the prejudice. Period.

They bet on people not suing and they're right most of the time customer don't demand. It does not mean, just because they actually get away with it by play dumb, that there are not legal basis.

It would certainly be interesting to see the limits of that law tested. Does a fragment in a cache count as them still having the data? What about a copy in an unallocated block on some disk? What about traces left after the data was overwritten (no storage medium is just bits at the physical layer) - are they obliged to extract every last bit that is technically possible?

Fulltime YouTuber here. Just as one datapoint, I was recently [very] pleasantly surprised to learn that YouTube was able to restore a video that I had accidentally deleted. It went back to being live as if nothing had happened—though my contacting support was admittedly right after the deletion happened.