Credit where credit is due, if we define a generation as a 15 year period of time, and we decide that Gen Z started in 1995 (for easy math), you do, in fact, land on 1665.
I don't know why the author thinks that Gen D doesn't exist yet, when the pattern of X, Y (Millennials), and Z make a pattern that both implies that the Latin alphabet's use is coming to an end for this purpose (ignoring that Gen X was named not as part of a sequence of letters, but by Douglas Copeland's book, which was titled itself using an existing phrase), and that can easily be extrapolated backwards through time.
It's an argument against seed patents and capitalism.