"Dan Sydlik and Henschel Milton don't fit into the new generation doctrine at all. They didn't see 1914 and they didn't survive until the Great Tribulation."
Dan Sydlik and Milton Henschel are part of this generation, but they are not part of those who will be at hand at Armageddon. According to the current understanding, some of the annointed whose lives overlap with annointed who were at hand in 1914 will survive the great tribulation.
I'm not sure whether it's about annointed ones receiving their calling by 1992 or born before that date. Since according to w10 4/15 it's the "lives" that overlap (some translated editions don't use the word "lives", but "are contemporaries of"), it seems logical that babies born by 1992 and due to receive their heavenly calling in the future might be considered as making part of "this generation". I'll ask an elder to confirm.