Impossible to cut the face – sounds good.
Shaves Easy, quick and clean – great.
Pays for it self in a fortnight – perhaps a bit of hyperbole?
Every undertaker and embalmer should have one – wait, what‽

It makes sense though, in that corpses are (and were) usually shaved to make them more presentable, and if the safety razor could do it easier, faster, cheaper and with less chance of cuts and the danger of infection… sounds like a great idea to me.