These are just discussing femtosecond lasers, I don't see any mention of coulomb explosions? Maybe it's implied, but I don't see it.
In fact it is mentioned explicitly in the wikipedia article:
>Coulomb explosions for industrial machining are made with ultra-short (picosecond or femtoseconds) laser pulses...Coulomb explosion etching can be used in any material to bore holes, remove surface layers, and texture and microstructure surfaces
It says coulom explosions are made with ultra short lasers, not that all ultra short laser pulses result in coulomb explosions, so for someone that doesn't know otherwise, you can't infer that whenever someone says ultra short laser cutting that it happens via coulomb explosions.