This should be an instance of Latin-Han hybrid whose encoding model is a subject of discussion.

Exactly, this is not a Han character. It's temporarily appear on this group of publicity materials. And we could replace 也 with every component to indicate all of the characters including the component.

See this SCMP article for additional background discussion of the "X也" gender-neutral 3rd-person pronoun. Refusing to encode this character would be doing a great disservice to the user community who want to use this gender-neutral pronoun form.

Additional discussion on twitter showing a glyph form similar to that proposed by the UK with 㐅 rather than X:

After discussing with some of my "transgender" friends, they all don't like to be described as ⿰㐅也. Some of them even think 㐅 indicates they are not persons and it comes out from some self moving people who are not belong to their group.

Re Comment #9489: Please note that this character is not intended for use by transgender people who identify with a specific gender. As noted in Evidence 1 (highlighted in red at the bottom), this character is intended for use by *non-binary* people who do not identify as either male or female: "{⿰㐅也}為中性代詞，代表非二元性別認同的跨性别人士". The character should be encoded for those people who wish to self-identify using the non-binary pronoun ⿰㐅也. Of course, cis and trans people who do identify with a specific gender will not want to use this pronoun, which is fine!