This is how I see it.
If the Guardian on “application form” states that trans people may be your date, and the applicant needs to tick that that is fine. Or if there is an “option” to include trans in your potential dating pool,
Then great. All OK.
If not, then unacceptable. They might as well match a lesbian with a straight guy, (mmm) or a gay man with a woman. I’m straight. If I turned up to a blind date to find a trans man, I would feel awkward, embarrassed, and if when I was younger may even feel the need to reciprocate to an extent to avoid accusations of transphobia. I think for a lesbian, finding a trans woman could feel worse, given the levels of harassment gay women get from some straight men.
This date feels way off. The woman concerned here may have been absolutely fine with it. The reality is that if she wasn’t, she cannot express that, given the inevitable result, especially given what has already occurred. Regardless of whether this particular individual felt fine, I think, unless the Guardian seeks consent pre date, this was wrong.