Not sure what do they say this. The number of failed Ts I have came across is the same as any other Rolleiflex. And from the failed ones almost all of them have problematic shutters mostly stuck open due to being neglected for quite long under humidity and dirt. Actually it is the same reason of failure as for all other Rolleiflex cameras.
My dad's T is in use since 1962 and it is the only camera he has been using regularly since then. I could not get him to give me his and thus I have bought my very own, a like new grey Type I.
Use it with care and it will never fail you.