It signals you don't have enough time or will to chase the latest stuff, otherwise you would have learned it with other cool kids half a year earlier. It carries some signal, but I would not choose based on this alone. I would even consider selecting against this to a certain point, but I also work in a place that COBOL on a mainframe. YMMV.

> I would even consider selecting against this to a certain point

I agree. A technology professional who views themselves as "one of the cool kids" (read: easily manipulated by social media) is a legitimate security threat, as are many of the popularly promoted approaches to "LLM-assisted software developement".