LTE would be when the TR just can't produce the thrust required to maintain or correct the desired heading. Caused by poor design or exceeding design limits.
Undemanded yaw is when the pilot hasn't applied sufficient pedal to maintain or correct the desired heading. Caused by lack of anticipation, awareness or skill.
Ref the 2001 article - all good except for the term Yaw Divergence - if it was used in the military, it was only by the RN, not the RAF or AAC.
From what I understand, the term divergence is usually paired with another axis implying cause and effect - ie yaw/roll divergence (Puma).
Ah,...another one of those, "we're from different countries" differences. I'll add it to the list.