If the mechanical drawings for these are correct the reduction in height is tiny. The Outemu snap switches are physically 3mm shorter without caps, and 2mm shorter with caps installed.
These Kailh mid-height switches are only 1.6mm shorter without caps according to the drawings. With caps on them the difference would probably 1mm or less compared to a full height switch. Why do these exist? lol.
The only upside is that they should work with regular stabilizers.