I think what the parent referring to is the DAO hack (from 2016) and how Ethereum’s response was to renege on “Code is Law” (and the integrity of the blockchain) in order to void those transactions (smartcontract exploits), which is a case of centralization resurfacing because VB could subvert the proof of work system when his own money was at risk.

Ethereum Classic is the fork that refused to rewrite the blockchain to void the hack, and the linked tweet is VB affirming that he’s only working on the main (reneging) Ethereum fork (which goes by ETH), not Classic (goes by ETC).

Not sure why the parent linked that tweet, maybe Twitter just makes it too hard it identify what tweet you actually want.