I know that was just speculation, but this may be what happened to me as a teen. To be fair, I also suffered mental illness so that could've been the cause of my withdrawal.In short no. Otherwise it would not be the dominant function. He's taking behavior and trying to make the theory work to fit an observation not the other way around. It is perfectly plausible though for the aux to be almost as developed as the dominant, and potentially during this process a person may come off as being their aux type (so an ENTJ might appear to be a Ni-dom as they are developing Ni, this would probably happen while the person was a teenager or so), but Te is still the dominant function.
To the OP, my answer is that this can certainly apply to MBTI, but it cannot apply to Cognitive Function theory. The statement you bolded is exactly the issue I've had up until recent years. To the untrained eye, I appear ENTP-ish apparently. If I were to predict my behaviour in JCF terms, I may currently be beginning to express my tertiary Se.