This market is unlikely to be resolved as invalid
In this context about means "Concerning; with regard to; on account of; on the subject of; to affect" https://en.wiktionary.org/wiki/about definition 4.
Using the Omen resolution rules (https://omen.eth.link/rules.pdf) "Entities are assumed to reference the most obvious entity with that name, taking the context into account."
This question is asked on the Omen prediction market platform, so taking the context into account, it refers to Omen, the prediction market platform.
So if Vitalik uses the word "Omen" but without referring to "Omen, the prediction market platform" it would not make the market resolve to Yes.
The question asks about Omen, so prediction markets, in general wouldn't be sufficient.
Using again the same rule "Entities are assumed to reference the most obvious entity with that name, taking the context into account.", the only famous and obvious Vitalik Buterin is the creator of Ethereum.