A very good summary of these arguments, great to have them in the same place. One thing that struck me about the “trans-women-ain’t-women” arguments is that so many of them rely overly on the Caitlyn Jenner fallacy, as you point out. Indeed the ove-reliance on this one example is striking. It seems to me that this is because it is much easier for them to generate wider connotations of ‘privilege’ around Jenner, and then attempt to apply these to all trans women.
The apparent TERF obsession with Jenner seems to me to be designed to focus cis people’s attention on one particular example of a trans woman whereas in fact she is an example of an increasingly rare type of trans woman; the older transitioner. Older transitioners are likely to become very much rarer in the future as acceptance of trans people allows us to come out and identify as trans at much younger ages, people born and brought up in the 1950s and 60s had to live through decades when being trans was simply taboo to the extent that only a few were in the position to transition or be openly trans, at least in European/N American society.
The fact is that the young trans girl who transitions early and never experiences any kind of male privilege is far more representative of trans women than the Caitlyn Jenners of this world, and will become far more so as time goes on.