I haven't read the comments, but my guess is that there are the Seles detractors who will claim that "her teenage years were her peak anyway".
These Nostradamuses are always the loudest here, trying to convince us how they know that Seles was stabbed at PRECISELY a time when she was about to start losing...
I wouldn't automatically say those years were her peak, but it isn't that far fetched either.
Graf's 88-89 was her peak, or atleast was her peak until 95-96 matched it and this was many years later.
Evert's 74-77 was clearly her peak, atleast results wise. Now tennis wise you could argue it was 85-86 due to having to rise her game for the challenge of a surging Navratilova.
Hingis's peak was 97-early 99, both results wise and tennis wise.
Mandlikova's peak was 80-81, both results wise and tennis wise probably, although you could argue she matched it years later in late 85-early 87.
Goolagong's peak wound up being 71-74, and her best year ever wound up being 71.
Serena with her incredible longevity of greatness still probably peaked ultimately in 2002-2003.
Venus's peak was 2000-2003, ages 19-23, and she is deemed to be a late bloomer, and player with incredible longevity.
Many female players have their peaks at 20 or younger. They have many more prime or good years, but often never surpass those early years. Certainly it is far more likely than Seles's magically, even through her father dying of cancer, and future years of injuries (which no way are entirely related to the stabbing and nothingelse) having a magical 10 year or so interupted period of peak play, as some of her more delirious fans seems to want us to presume was likely.