Frankly, blacklist/whitelist is actually less clear than blocklist/allowlist in the most strict and rhetorical language. Similarly, master/slave is actually less clear than alternatives, because it implies single points of failure that technology has already resolved.

I don't actually have an opinion on the language change (I'm not black so how could I have an opinion on if it empowers black people?) but strictly speaking the rationale based on clarity isn't true.