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No, because singular they is a well-established idiom that conveys "unknown gender", it subsumes people who actually prefer "they" as well as people who prefer "he" and "she".

"He" used to serve that purpose and subsumed people with all pronoun preferences.

English needs a construction for referring to an individual that you don't know. They/them is fine. Someone somewhere is going to decide to get up in arms about that, and there's just nothing to be done about it since it will be a demand to know them before you know them (logically impossible), so don't worry about it.

No, because "they/them" is valid for everyone.

The they/them pronouns are used in place of he/him/she/her because they are ungendered. I fail to see how the use of ungendered pronouns are exclusionary.

"They/them" are also preferred pronouns for some non-binary people, in which case they are being used as gendered pronouns.

It certainly seems biased towards conjoined twins.