Here's the thing: trans isn't new. Cis people have mostly just been Not Paying Attention when trans people have tried to talk about it for at least the last couple generations. Or paying attention for a while and then forgetting and saying "but it's so new" again the next time it comes up.
But the quotation isn't even mostly about the language -- more extent to which socially constructed spaces and perceptions are so gendered and the expectations are so binary gendered. It's not just the language or even mostly the language; it's the stuff the language describes or doesn't describe or confuses, most often doesn't describe because most people aren't noticing and talking about it. Unspoken assumptions, gender-lensed perceptions, and unexamined expectations.
Re: Inventing Language
But the quotation isn't even mostly about the language -- more extent to which socially constructed spaces and perceptions are so gendered and the expectations are so binary gendered. It's not just the language or even mostly the language; it's the stuff the language describes or doesn't describe or confuses, most often doesn't describe because most people aren't noticing and talking about it. Unspoken assumptions, gender-lensed perceptions, and unexamined expectations.
But that's not new either.