Vitalik Buterin is involved in TRST, that's great, I didn't knew it.
He is not! He distanced himself from it long back! He was a advisor earlier but when asked he soon distanced himself away from it.
But he's still an advisor. Just because he doesn't tweet it or talk about it much doesn't mean he's not an advisor. All the people listed are advisors, but most of them don't talk about it much. WeTrust still contacts them when their expertise is needed.