Crystaldiskinfo shows 'available spares' increased on USB SSD - is that possible?

I have a Crucial X10 pro that failed while running as an external boot/system disk on a Mac. When connected to a PC, Crystaldiskinfo showed 'Bad' in red and 0 Available spares.

I tried an assortment of different tools, most of which said they wouldn't work with that drive, although SeaTools 'fix all long' seemed to do something - and I left it powered up but not mounted for a long time in case the claimed 'background garbage collection' did something. I have been able to reformat it, and now Crystaldiskinfo shows 'good' and 0000058 Available Spares. Should I trust that? And if so, what tool might have fixed it? I was under the impression that the spare blocks was a factory setting that you could not be reset and wasn't really expecting it to work.