What they call Type IV Tiger Eyes are opaque.
There are also Tiger Eyes and Tiger Eye kin which are not in that list of four types.
For example the transparent whities are not in that list, but at least count as kin. And count as actual Tiger Eyes in some people's book.
Edna is the first person I remember grouping blackies with tiger eyes, but it does make sense. Of course they were sold under their own name, but the construction looks the same. . imho.
ah, you added another question while I was typing ... Vitros which aren't veneered? how about the tri-lites? Hope someone else can address your question more fully. I felt up to the challenge when it was only about opaque Tiger Eyes. :-) About the rest of the Vitro possibilities ... well ...