Oh dear,
I would never suggest that anybody was talking rubbish whilst recounting their experiences, unless I had flown with them during 100% of their flying career. You haven't, so please don't.
It was several years ago (sometimes pre-R.V.S.M.) that I flew the 550 down to the South of France; so perhaps my climb was held at FL250, not FL200 and maybe the French now move you over so that others can overtake, but I can assure you that on numerous occasions our climbs were severely cut short because of our speed. This happened only in France. Fact not fiction. If it's changed now, then good although since aircraft are getting faster, not slower I would be very surprised if pilots of the older Citations are not coming up against this situation on a regular basis.
Anyway, the reason for my original remarks regarding curtailed climb clearances were in the context of this thread. Many potential buyers of the Eclipse will be private owners. It would be a shame if any of them purchased one on the basis of a predicted fuel burn plan on a flight that they were doing regularly, only to find that they were not able to climb to FL380 (or whatever) in some ultra short time, because French A.T.C. held them at a lower level because of their slow speed.