It's definitely true that some trannies can pass, but this is invariably and strictly under very specific circumstances (read: still photographs that are heavily doctored and filtered and usually taken professionally, utilizing flattering camera angles and lighting). Some troons can absolutely pass as female under said conditions, but the same thing could be said of just about any man you can think of.
When you meet a troon face-to-face (even the ostensibly best 'passing' one on the planet), there will always be something that tips you off. It could be their voice, their gait, their posture, their body language, the size of their hands- there will always be something that the lizard brain picks up on. This is something that trannies will apparently never understand and it's just like that copypasta says- we have evolved over millennia to determine whether the person we are looking at is male or female with remarkable accuracy.
All they have on their side is fake shit and filters. Take all of that away and not a single one of them passes.