Do you have any evidence for your claim?
Because the first time I heard about it was from 17 years ago when a black man complained about the use of master/slave and filed an EEOC complaint. See https://www.snopes.com/fact-check/masterslave/ .
Your hypothesis is that virtue signaling describes the movement to get rid of the term.
Have you considered that the term master/slave was popularized and maintained as a form of virtue signaling?
Quoting from "Broken Metaphor: The Master-Slave Analogy in Technical Literature" by Ron Eglash" available from https://sci-hub.st/10.1353/tech.2007.0066 :
> ... being unconscious of social mores was a good sign for a future physicist, because physics transcends culture. Perhaps this kind of emphasis on a technical identity is at work here, too, and the master-slave metaphor is attractive to engineers because its free use “proves” that they inhabit a nonsocial or culture-free realm, which is a matter of professional pride