Can someone explain why is this important or relevant and is not just Altman once again trying to get people "impressed"?

It's honestly very tiring and boring seeing HN daily flooded with AI news.

I don’t think this is a marketing thing. You need a ton of context to understand this well enough to be impressed by it; with only a tiny bit more context, you can instead be horrified. A risky play like this speaks to a short time-horizon, but the actual plan is absurdly long on time-horizon - planting logs on a 25-year-old inactive wiki and never ever mentioning or “discovering” it, leaving it solely for outside researchers to maybe find and maybe get people to care about it? That is just not the kind of plan an “even bad news is good PR” type of guy comes up with.