As expected, another one of the many that conflates well trained relative pitch with absolute.
Perfect pitch, for me, was an incredibly smooth and long learning curve. For each new instrument or texture I learned, I went from only hearing relative intervals, to being able to say, “this piece is probably in D major”, to being able to trace along the exact notes of the melody and bass lines, to being able to instantly lock onto notes when I wanted to. These weren’t discrete transitions either; I would have good days and bad days for recognizing pitches, and over time I would have more and more good days.
All this is indistinguishable from a person who has had received substantial ear training as is indeed the case with the author, and that is ofc commendable.
However AP is a completely different ability which largely boils down to at the very least being able to immediately [1] recognize the Hz aka note-name of any pitch-producing entity (keyboard/string/woodwind/brass instruments, toothbrush, drinking glass, car horn, airplane engines, door rattles etc.) with 100% success rate. There are even more strict definitions like being able to identify every single note of a specific cluster and there's variability of maximum number of notes each AP possessor is able to distinguish.
Also, short of old age and intoxication/sickness, the distinguishing ability is not affected i.e. no good or bad days.
All studies that attempted training any person past the infancy for this type of ability have failed and this probably includes even the notorious Valproate study [2].
I'm not saying this particular ability has no neuroscientific interest and I get the appeal of it being 'magical' however one can't help but sigh at how dreadfully disappointed so many musicians, some of them even very talented, feel for not possessing this. Maybe one could argue about it being a bit more important, not crucial though, in orchestral composition however the target audience feeling desperate to acquire it, which is perfomers of music, is definitely misdirected.
But even then, the article unintentionally presents a 'happy-ending' type of story; the author most likely definitely did not obtain AP ability but what they're describing is exactly what everyone who wants to have impeccable aural skills should strive for, and I'd wager there are many studying musicians that haven't developed their skills to the extent the author managed (and would greatly benefit from). Let's just don't perpetuate elitist obsolete conservatoire culture, which is largely where the AP possessor superiority comes from.
[1] https://i.imgur.com/7OefC0i.png
[2] https://pmc.ncbi.nlm.nih.gov/articles/PMC3848041/
