I have a gut feeling that it's something more than mere virtue signaling. We know these creeps love their symbolism - what if this too is another extension of that?

After all, a sign language interpreter only repeats what they've been told, and has no voice of their own.

Fits the motif of the "deep state," which uses puppets and actors to front its operations - telling them what to say and do in order to further specific goals.

I dunno. Bit tin-foil-hatty, but these are unusual times, and something about this sign-language silliness has never sat right with me.