I have repeatedly connected kegs to pumps nominally rated at 50microns, and not collapsed one.
That doesn’t mean you can’t, just that I’ve never actively tried 
I’ve collapsed a 55gal drum with a hand pump ( simply forgot to open the vent!!)
Having a keg with nothing in it collapse isn’t likely to ruin much more than the keg, if it’s partially filled with liquid, it probably won’t collapse. Because: vapor pressure…
Not saying they’re rated. Just that sucking on them to move liquid around works well. As does positive pressure.