TMo themeselves are testing 4.5 versions...likely .37 and newer. They are not purposely killing sim cards. Sim cards were getting damaged with .37 but with .42 it doesn't seem like it's as big of a problem.
I only know of one reported case of sim card failure with OS 4.5.0.42. I've not seen anymore than that one. And considering the user who it happened to....anything is possible!
