I won't take your word for it but leaving that aside, what I'm arguing, based on my research and observations, is that Tang Soo Do had already formed its own Korean identity, and so the name change was intended to reflect a change rather than impose one. That is not to say that additional changes didn't occur.Sir, that is your misunderstanding. There was a meeting pegged as April 1955 (With some info that may not be accurate) agreeing to adopt that name.
This was vigorously opposed by many and took quite a while to become a reality. It really did not happen much if at all to until 1960 or later. Further, no one claimed that the instant a name was adopted a switch was flipped and other systems magically and immediately changed their technique. That did not mean TSD people were suddenly doing TK-D
If you don't think that TSD had its own identity, then you have to account for why they kick TKD-style with the hips, why they spar TKD style with the legs, etc.
You also have to take into account that the supposed revolution TKD brought to kicking by emphasizing spins, jumps, and turns was already taking place in TSD, as stated by Chuck Norris stationed in South Korea 1958, joining a TSD school performing moves we today associate with TaeKwonDo.