The Kodokan Kansetsu-Waza video demonstrates a number of variations of te-gatame where uke's arm is pulled up their back, applying a hyper-rotational lock to the shoulder (sometimes called a hammerlock or chickenwing). In fact, all variants it describes (except for the first performed from standing) appear to be shoulder locks:
Unlike with other explicitly banned techniques demonstrated in the video (e.g. ryote-jime with the legs, ashi-garami, do-jime, daki-age), the commentary makes no mention that these locks are illegal.
Such techniques have occasionally been used in high level competition, but there seems to be inconsistency on whether hansoku-make is given.1
Are these variants of te-gatame legal?
I had always assumed not, since they seem to be explicitly targeting the shoulder joint, but the ban on joint-locks anywhere other than the elbow was in place long before this video was published, and ude-garami is permitted as a long-established judo armlock despite also targeting the shoulder. Note also that the IJF explicitly lists te-gatame among their recognised techniques (code
Hansoku-make GP Düsseldorf 2017 | Heinle vs Khammo | 100+ (switch camera to "Tatami 1")