Yes, that post was slightly tongue-in-cheek.
Though I think I have a point. Dull, non-varnished oil-finished walnut is better camouflaged compared to black. Black is not camouflage, even at night, when dark green is better (especially as colour vision fades to shades of grey).
Look at the evolution of British military rifles since about 1880: everything up to and including No4 Lee-Enfield, the exterior is mostly brown; early L1A1, black metal with brown wood butt and fore-end; late L1A1, all black; L85A1: black with green furniture (to hide in German forests); L85A2: same but green-brown; new L85A3: mostly light to mid-brown, including the metal.
We have after a fifty year hiatus gone back to the colour scheme that worked ever since the miraculous military discovery in the late nineteenth century that dressing in order to be harder to see correlated with being harder to hit.
Of course, that doesn't apply directly to birds and animals, which do see things differently from us, but none of them see black as invisible.
Nor does it change the differing handling, resonance and other characteristics of artificial stocks ranging from the cheapest plastic through to high-end carbon-fire jobs.