It is more complex than that. If a person is willing to take part in a trial for which she doesn't meet the necessary conditions, she is also willing to fake test results or possibly just had a Covid infection in the past year without influence on their previous condition (Post-Vac). The person above never mentioned having a mild infection so I'm not sure we can assume it, a friendly doctor could have also just written a confirmation letter, who knows.
Secondly the time frame doesn't match. Even if the trial was for Long-Covid+Post-Vac, almost everyone in Germany had their last vaccine more than a year ago, whilst illness onset for the trial is <1 year (plus this person claims to have had an IA last year has done HBOT and other things, which makes the 1 year timeframe even less believable).
All in all it is very bad if people participate in trials that don't have the condition and criteria described necessary to participate in the trial. It doesn't speak for the quality of the study if 1 out of the first 3 people don't even have the condition and it certainly doesn't speak for the rigour of patients selected (note: post-vac patients don't have many doctors they can go to without being dismissed, as such they all go to the same doctor, let's not hope that BC is recruiting from such a databasis). Of course it can still be that this person isn't part of the trial and is only claiming to be part of it, or just claims to have Post-Vac on the internet.
I agree it's very hard to be active on social media with anti-vaxxers being all over the place, that also makes it harder for those with genuine Post-Vac. I also believe Post-Vac is 100% real, but that there'll be cases which might also be stemming from mild or asymptomatic infections, but that isn't really relevant in this case. In this case a person is taking part in a trial, where she has no right to be in. Or people are just pretening to be in trials which they are not part of.
I don't think we have to read too much into it, but people should be aware of these things. Let's hope the EMA isn't.