There is more emphasis in public life now, but no-one normal would read that article in1997 and think it was other than deeply creepy
Yes, I agree that it's difficult to imagine anybody ever reading the article and not seeing that Lee has been abused.
However, I think in Tatchell's head he is arguing that it's fine to have sex with a 14 year old boy because nobody cares if older men have sex with 14 year old girls. This was written less than 10 years after Bill Wyman married Mandy Smith. Their relationship was certainly scandalous, but they still managed to have a big white wedding.
I think now (at least in the UK) people are unconcerned about the behaviour of consenting adults but far more aware of abuse. In the 80's, Bill Wyman was certainly seen as a dirty old man, but also lucky. Now you would hope that most people (who aren't Peter Tatchell) would be able to explain why the relationship was wrong.