I guess we're all "outed." But I, too, seem to recall finishing college, in 1971. Indeed, I had a single class in philosophy, probably in the junior or sophomore years, 68-69, in the range of 35 years ago. It would be interesting to check whether the word "monad" ever came up therein. Alas! There's no way to do so. There is no record sufficiently detailed anywhere, especially not in my head.
Rather reminds me of the admitted limitations of the fossil record. Some humanly useful information exists for a time but is simply destroyed. (That in turn reminds me of a discussion on another thread about whether humanly meaningful information can arise without intelligent intervention. I don't see why not.)
Anyway, the syllogism presented by the quote would seem to be--like most creationist argument--deliberately fallacious.