To me it sounds like he knew she was vulnerable so got her drunk and got what he wanted. Not very pleasant.
If he was just a few years older - 18 not 16 - I'd say it sounded very like predatory behavior as he that young it does sound more like a drunken embarrassing teenage mistake.
Given his version of the story she’s very forgiving.
I think she taken the moral high ground and it's very well pitched stab to restore her reputation.
She wasn't a predatory older woman but a drunk upset teen pretty much the same age plied with drink by him.
It wasn't her idea - but at same time in our society drunk woman are harshly judged but she chalks it up to drunken teen stupidity - and doesn't blame him blames them both.
Manages to say he didn't come across as a virgin and also suggest he was shit - not bothered with her enjoyment but then excused that with his age - then how she was left to face their mates and their judgement and deal with aftermath and then he ghosts her - and her circle changes. Many people have had that experience - it's shit behavior and then there's speculation perhaps her circle changed because of more than them growing up - and that happens without hints or saying so.
Then she moves on with her life never thinking about him or this embarrassing mistake till he write about it and then she dealing with friends who knew texting her and then the press. Put him in place of unimportance - such a minor thing she wouldn't be bringing up years later.
She comes across as a nice woman who made a drunken mistake when upset and kept quiet for over 20 years - she manages to look classy and stick the boot in and look very believable much more so than him and she has quiet cleverly taken back some of the narrative control he took from her.
Even without money I can see why she did the article - and if he's making money off it why shouldn't she get some compensation for the bomb he exploded with no warning in her life.
It's also perfectly possible she wasn't his first - and they still had drunken sex - she said she was unaware he was a virgin - and he threw her under the bus as unimportant while perhaps the other person has some social standing in his current circle - I don't know and I'm unclear how Rupert Everett could be so sure an not just repeating unfounded gossip.