Maybe I'm being too pedantic - wouldn't be the first time!
Probably

, but as a pedant myself I understand the desire to "get things right". For example, I do wish that people in the paperweight world would stop assuming that "made by Ysart" clearly means "made by Paul Ysart" - but I have stopped trying to change the whole paperweight world and just accept that it was a term used for many years before I got into collecting anything.
Anyway ... the context of the quoted text re: "cameo engraving" and "intaglio engraving" is as an explanatory box (highlighted with grey background and black border) at the bottom of a single page of very brief comments in a section titled "Engraved Glass". In that respect, it seems to be a simplified way of describing the difference between "raised" and intaglio engraving.
The term "cameo engraving" is also used by silver engravers such as in
this website.
I'm not saying the term is right or wrong, but is certainly also used outside of a glass context.