With all due respect towards the late Lumsden of Cushnie, wouldn't you agree that it's a bit contradictory that he deplored the wearing of off-white kilt hose, as he can be seen wearing a pair in the photo below. I think in this particular context of traditional Highland day attire, he looks quite smart and the off-white hose work well with his overall outfit.
I'm not familiar with what he actually said about white or off-white hose, but it looks to me like the hose he's wearing in the photo you posted may actually be more like oatmeal or a light tan/khaki or tea-stained colour, with perhaps the colour being washed-out a bit in the sunlight. And while I also tend to dislike white or cream hose except in rare circumstances, I do own a pair of light tan hose. I rarely wear them (in fact, I haven't even seen them in quite some time and had forgotten about them until now), but I think it's dark enough that it doesn't give off the same look as white/cream. Especially, as you said, with daywear. Personally, I think he looks great with those hose and wouldn't think twice about wearing some like that.

Which is the long way of saying no, I don't think he's being contradictory.