is there a clearcoat on the post? use may be cautioning about lubricants wrt to that rather than the underlying cf
for a cf post the only thing i use is some carbon compound, or on a metal post some anti seize, never grease, too slippy
epoxy can absorb water and swell (slightly) and there are various chemicals in cycling use that affect it, hexane for instance, but then hexane is the common solvent in glue for tubs, which is fine on cf rims, similarly acetone is widely accepted as ok for degreasing rims, it's another chemical that affects epoxy, but with such light exposure it's presumably not an issue
I'd also suspect the clearcoat issue. Some clearcoats are very susceptible to solvents. I've seen some on rims where you don't really notice the damage from solvents but if you look close, the coat is degraded -- it just doesn't affect the basic integrity of the rim. The manufacturers' warnings have to take into account all kinds of mating components from obscure places (like anonymous Chinese brands or small boutique lightweight shops) that don't research the matter properly. In closely mating items, like seat posts, it only takes a very tiny bit of reaction with a clearcoat to cause jamming, not necessarily even visible.
As for acetone, I regularly use it because it flashes off quickly and does remove adhesives including rim cement, but I also have seen it affect rims and other components, at least at the clearcoat. Not that I wouldn't continue to use it, but use it with caution. There are a thousand clearcoats out there and not everybody uses ones that are adequately resistant.