The BladeForums.com 2024 Traditional Knife is available! Price is $250 ea (shipped within CONUS).
Order here: https://www.bladeforums.com/help/2024-traditional/
It is pretty thin, the presidio is also another thin hollow ground blade. But yes its a good slicer, at least IMO.
The larger 550 is NOT hollow ground, I'd make sure the smaller one is for sure.
Rather than looking at the website specs, why don't you look at a blade. This is a custom shop s30v 550 blade, it was coated:
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Were it hollow ground, it would not have a grind face as flat as a pancake (I flatsanded off the coating).
I'm not saying the 555 isn't HG, I don't have one to look at.
But the 550 isn't.