The arrest and person's history is now being more widely reported. It is real.
Everything in that NY Post article is a straight statement of facts, unlike most previous reports from places like the Guardian, which were mainly speculation.
The stuff about the charges were, as Purgatory noted, later confirmed by the police. The rest is public record.
The NY Post did investigation to deduce Merager's identity, to get the scoop, went through the public record, and then got the interview. Textbook journalism, making other outfits look like idiots.
The only possible scope for misrepresentation in that article would be misquoting Merager.
So worrying about the source
(On which note, a puzzle for FWR readers. In the quote "You allow [trans women] to go in there [women’s spaces] and then people simply claim indecent exposure and you’re arrested”, what is "[trans women]" substituting for? I've not found an obvious answer.)