Definitely the `Chain of Trust` concept can be applied to anything. For example Social Media Protocol developers have thought a lot about using CoTrust, to be able to block undesirable people (moderation), by following a 'whitelist' only of users you trust or ones they trust, down a dependency tree of trust. Interestingly you could decentralize this onto some Relay system like Nostr and use Crypto signing, where each "trust" is Crypto certified to be correct, rather than needing to truse a central server/authority.
The word has different meanings in different contexts. In Social Media context calling Nostr decentralized is in every way accurate. But this will be my only post with you debating the definition of words. Hope you enjoyed it.
He will just continue the "No True Scotsman" fallacy, asserting his definition of the word is the one true and pure one, and all other uses are thereby wrong.