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I can remember reading that at the time and feeling a bit queasy, especially about the thigh being the optimum bit of flesh.

Check this out....

https://sharprazorpalace.com/strops/91785-article-1897-human-skin-razor-strop.html

Never heard of finger stropping, sounds like a recipe for a nice cut to me.
I do palm stropping on occasion and always palm strop a new DE razor blade.