For those who didn't read the article, the game is already released, it's the Paper Mario Thousand Year Door remake.
In the Japanese text of the original gamecube release, Vivian was a trans character. The English localisation of the Gamecube release cut out all references to her being trans.
The article is saying the Switch remake's English translation now contains the cut dialogue that fleshes out Vivians backstory.
In the original Japanese translation, Vivian is referred to as an otokonoko (which also can mean just "boy") and the game often uses otoko (man) and otoutou (little brother) to refer to them - so the intention was most likely to paint them more as a crossdresser.
English localisation completely removed all traces of these, just makin Vivian a girl.
And now the remake, for both languages, makes Vivian explicitly trans.
I feel it's worth noting that everyone calling you he/him or "little brother" or "man" doesn't make you not a girl. She's referred to in game as オトコノコ (otokonoko), which is written ambiguously like that so it can either be 男の子 meaning boy or 男の娘 literally meaning "male daughter". When she's referred to as 'man', she feels insulted, and she uses feminine first-person pronouns and calls herself one of "three sisters."
Saying she's "just a crossdresser" is a possible interpretation, but not one that is clear and unassailable. In translation, she's either just a girl, explicitly trans, or somewhat ambiguous more like the original Japanese, so the people publishing the game don't seem to think of her as just a crossdresser.
All that to say, she's been trans for a while, even explicitly, it's just happening in the English version of the game now.
I feel it’s worth noting that everyone calling you he/him or “little brother” or “man” doesn’t make you not a girl.
Obviously, but when the narration and descriptions use those as well, it gives it more importance than just having other characters misgender them in conversation.
男の娘 literally meaning “male daughter”
Which is the otokonoko I linked to. If the term was used today it would be much more ambiguous, but the game came out in 2004 when that term was essentially only used for" crossdressers" in Japan - what I guess we'd these days call femboys - and basically never for trans people. That meaning came almost two decades later, and some would even argue that it shouldn't be used for them at all.
when the narration and descriptions use those as well, it gives it more importance than just having other characters misgender them in conversation.
Maybe, but it could also just be the nature of the culture at the time to talk about trans people that way. "A boy who thinks he's a girl" is just, by our current understanding, a transphobic description of a trans girl.
the game came out in 2004 when that term was essentially only used for" crossdressers" in Japan - what I guess we'd these days call femboys - and basically never for trans people.
I'm not close enough to say with any authority that it was or wasn't, but the use of that word, even in third person narrative descriptions of her, doesn't really sound like "they're definitely just a crossdresser" so much as someone euphemistically describing a trans girl. Especially when the character herself references herself as a girl. That right there is really the most important part.
By all means don't just trust the word of a random girl on the Internet, but there ya go