Virtue signalling is when you brag about how woke you are while doing the absolute bare minimum. >JK Rowling: Every other character in Harry Potter was gay, black, or trans and I've just never mentioned it>Feige: Endgame will have the MCU's first ever gay character, a random NPC with like one minute of screen time about being sad
This is virtue signalling, because it's bragging about something inconsequential >K.A. Applegate: I'd put a gay character in Animorphs if I made it today but that wasn't something I was thinking of in the 90s but if you want to write a fanfic where Tobias is trans don't let me stop you.
This is not virtue signalling, because she's doing something small but not pretending it's a big deal>Rebecca Sugar: I made a show about space lesbians and every third episode is about lesbians and one of the major character is two lesbians in a trench coat trying to sneak into an R rated movie and they kiss a lot and get married.
This is not virtue signalling, because she's bragging about how woke her show is but her show is pretty fucking woke.
Ratburn's reveal is very minimal (it's the punchline, because the episode is about how the kids thought he was marrying this huge bitch who ended up being his sister and him marrying some random dude was the reveal), though it being on a PBS show still makes it noteworthy, especially since it's a PBS show that had been banned from having gay characters in the past, so I'd declare it not virtue signalling.