Comparing generic "testosterone esters" - https://en.wikipedia.org/wiki/Androgen_ester - from the fifties to "testosterone esters" from today, without knowing exactly which kind of medication was involved or how it was administered, doesn't seem like a good way to reach any kind of conclusion.
Assuming you're referring to procedures around altering one's body to resemble the opposite sex, there're no long term studies on the effects of modern drug treatments, such as lupron, especially when given to children and adolescents.
The highly ideological activists surrounding this issue have made this field a wild-west, and I fully expect in the coming years, there will be more and more similar stories coming from women in particular, who have been damaged by inappropriate hormone treatments prescribed for what turn out to have been unrelated mental health issues.
It would be weird, in fact, to wonder about trans women, hormones aren't that fungible.
We could also compare the East German athletes with bodybuilders if we wanted, of both sexes and any gender. Turns out they die early as well.
Also, if you're going to go wading into these waters online: the spelling trans men is preferred over transmen.
Edit to add: Trans men includes Buck Angel, so let's not pretend there's an arbitrary limit on testosterone use there. Much like cis men, some trans men want muscles much larger than any normal amount of testosterone will produce.
There's no argument from nature to be made about medically boosting hormone levels.
But the various chronic illness support forums I follow have a lot of trans people with tons of serious issues.
Maybe trans people are more likely to seek help online. Maybe I don’t count well enough.
I keep an eye out for issues I can offer advise for. I do notice trends after awhile.
The biggest is probably people that refuse to change to try a healthy diet.
Some groups just want to complain about how bad life is. Other groups are trying hard to get better. They take a very methodical approach to treatments and tests.
Lots of people simply need help to know what kind of specialist to see next. Or advice when doctors give really bad advice. (Happens all the time)
The really confusing ones are often taking lots of hormones.
Or rather, no, like most things, it should be ignored until it's confirmed to have data. That is, things are not (true until fault is found), things are (non-true until factual support is provided).