When Bitcoiners say decentralized they mean, in fact, that its value (through some gating mechanic like issue or "censorship") is not controlled by a government, as if this is somehow any better than the value of one's wallet being controlled by unknown parties, front running exchange operators or mining cartels.
Bitcoin proponents pretend that government centralization of money supply is the only kind of centralization of money that needs fixing, and its mechanisms are thus designed to make an elaborate show of diffusing operational accountability while doing nothing to counteract a pathological concentration of leverage.
As a result, it doesn't actually decentralize anything, it instead relocates all of the centralization under obfuscated cover. This in itself isn't a problem, if promoters would upfront about it. But then no decentralization meme would certainly mean no Bitcoin at $30k, and what's the fun in that?