It probably is, although this would be a good question to Ceska Zbrojovka as to what their drop safety protocols and the whole -29 degrees deal are. Probably no less safe than series 70 1911s with XP and titanium firing pin.
From the standpoint that @Bucky brought up, those kind of safety setups are unenforceable, which is why I'd still prefer a firing pin block.
Besides enforcement issues, I dunno if you were already on this site when I last mentioned me dropping a gun during National. That gun having FP block was actually reassuring in retrospect. Unfortunately the sob didn't run.
I dunno if changing out factory springs and pins counts for disabling a safety. I think that solution to that questiin could be borrowed from IPSC rulebook.