Hi Kerelos,
No worries, good attention to detail. By more stable, we mean that that enol is more stable than a regular enol. A regular enol is like 1 x 10-6 in terms of frequency.
Because of the 6 member H bond ring, that particular enol is more stable than a typical enol, but as you rightly point out, not as stable as a ketone.
Hope this helps!
Katt