Can confirm, I have used it to lube Cherry MX switch housings on keyboards. The great thing about it is it won't dry out over time because it's already dry, although, it wasn't the best choice for my application.
Is there something unique to your application beyond the parameters I’d expect are typical for mech keyboard use? Buy one, use daily, and expect to work indefinitely?
Extra lubrication of keyboard switches using Krytox oil/grease lubricants enhances the feel and sound of Cherry MX-like keyboard switches. The downside is it can dry up over time, get contaminated with dust, and actually result in a worse experience. I wasn't planning on ever lubricating the particular custom keyboard ever again, so it's for this reason I considered molybdenum disulfide, a dry lubricant that's been used for Alps keyboard switches. Molybdenum disulfide is used for dust-prone Alps switches because dust contamination will not impact the dry lubricant's performance.
I'm curious what you regretfully believe the best choice would have been.
I suppose molybdenum disulfide was the best choice given the constraints - the switches for this particular keyboard were likely to become contaminated with dust. Dust has a very low impact on molybdenum disulfide performance compared to oil/grease lubricants like Krytox. Without having to worry about dust, Krytox would have been a better match because the keyboard switches had silent stems. These stems have softer materials on the sliders to dampen key press and (more importantly) upstroke noise. These softer materials can be dampened even more with thicker Krytox greases, however, those greases are dust magnets.