Among them, the definition and orthodoxy of Rollups are mentioned again. The founder of the ZK-EVM project, which focuses on the first type of Rollups, Taiko, @danielwang.eth, tweeted today that any Ethereum rollup using an external data availability layer (DA) is considered as Validium, but this statement drew a response from Vitalik.
Cancun Upgrade: V God Supports Validiums over Rollups for Certain Products