We come into this hobby to have a lot fun in very guarded secrecy. No doubt many of us have had issues that would hurt or cut our chances for that, and then many of us still want risky services too. We go on for years in this way. Escorts, including transgenders, probably have much the same story yet it's likely we never ask about anything they've done that could turn us off of what we want.
Transgenders are no different. They are here for a purpose, to make money, but because who they are offends our sensibilities we expect them to be honest and open in a business where secrecy is everything. Do you think they will do that when the rest of us don't. Do you think they will throw away all the $$$ they can make because you find being with them, IF you knew, objectionable.
No matter how wrong it is to deceive none of the escorts or transgenders are going to tell you things that will cut their profits, even if you ask.
The issue isn't whether it's wrong transgenders don't tell, the issue is whether you understand what situation you have chosen to get into. Whether you think a transgender is dead wrong about not revealing her past or not is not going to affect the secrecy EVERYONE needs to enjoy this hobby.
Cheers