Here is a quote from the Falcon 900EX AFM
“CAUTION
The maximum operating limitspeed VMO/MMO must not be deliberately exceeded in any regime of flight (climb, cruise, decent) unless a higher speed is authorized for flight test or pilot training.”
As VMO may be deliberately exceeded in some circumstances it can't be an absolute limit.
By the way, for those of you who have not had the pleasure, Dassault aircraft fly beautifully.