I appreciate that video but after watching it I'm definitely not an optimistic nihilist as described in the video, I think while the video does caveat a lot of it's statements and I do overall agree with its sentiment it's too definitive and confident in certain areas.

"Existential hope" is definitely my position, no confidence, certainty or belief in nihilism required, just inject even more uncertainty and the nihilism goes away as well.

It means that in contrast to the video summing up its point by saying "do what you want and bonus points for helping others", I say that discovering and investigating and progressing is actually an imperative task.

I think the divide may be that I neither presume or reject as default materialism as the final truth, the video doesn't explicitly either but it does frame things in a way that I never would and it's conclusions for a meaningful life are also a narrower subset of my position in some areas and broader in others.

My possibly false impression based on the video is that optimistic nihilism takes for granted that materialism is a starting assumption.

I think while materialism is our current empirical observation I don't know if that will hold up long term as the underlying nature of reality.

Existential hope works equally well for those who lean or suspect that this underlying nature is deist, theist, atheist, materialist, metaphysical or dualist.