Interesting reading; thank you. Though after following the threads for a while and going through the original fulldisclosure posts, I've come to the following thoughts:
Generally seems a bit of a grandiose story with no real evidence backing it up and likes of which have never been repeated, either (though if you know of other 3/4G hacks please say). This was also the same year Karsten Nohl was cracking GPRS [1] (which was extremely novel) and I wonder if the these two events have gotten conflated.
The little bit of evidence given on the FD post [2] and the comments on your reddit link seem to imply this was very much a hack against WiMAX, which whilst called a 4th Generation technology, bears little or no resemblance (or history) to the 3GPP standard known as LTE/4G. I think this is where the confusion comes about and the reason why 3G wasn't broken as a side-effect. We're both using the term "4G"/"LTE" but we mean different technologies.
