OP linked an article at 18:24 on page 2, denying any connection between a (trans)gender identity and gendered behaviour saying:
No, it doesn't. Gendered behaviour and gender identity are 2 different things, which is why some trans girls are tomboys.
www.newsweek.com/transgender-kids-living-identity-develop-cis-children-1471729
For anyone who'd like to read the actual study, there is a link to a PDF version on this page
As seems to be the case with other references posted by the OP in evidence, this study does not deny a connection between (trans)gender identity and gendered behaviour, let alone disprove it. On the contrary, it emphasises the connection, finding a strong adoption of the stereotypes associated with the opposite sex in the vast majority of the transgender group.
(I should add that gendered behaviour is only one aspect of the sex stereotypes and sex role stereotypes imposed on us - and measured in the study - preferences for one peer group over the other, and for the toys and clothing as well as for the hobbies and interests associated with each sex also play a role).
FWIW, tomboy refers to quite a specific type of girl, and that word does not mean a such a girl does not conform to the stereotypes society imposes on females in other ways. The existence of some male transgender children who engage in some masculine pursuits therefore does not disprove the connection drawn by the doctrine of gender identity (and trans rights organisations as well as campaigners) between transgender identity and gendered behaviour. Especially since these children typically do indeed embody other opposite-sex stereotypes.
(In my view that study, while interesting, has a number of shortcomings and it's also odd in a number of ways, not least of which is that it builds up strawmen to examine and then happily knocks them down. What that is supposed to prove I do not know. But read it for yourself if you like. At least now we all can.)