I've seen variants of your situation several times in the past. CEO meets someone, is impressed in some manner, passes the contact over to the lower-level person, that person has no time/interest/need for candidate and the process halts, usually after initial expectations were high.
I'll also say I find it a touch odd that after this single experience you find it necessary to post the whole thing here.
tldr; you have some experience, you pursued 1 job opportunity which wasn't even an actual open position req. and then you didn't get hired.
You could fill 100 HN sites with 1000 variants of that exact same story EVERY DAY.
Again, not trying to be harsh, just trying to filter the reality out of this, which is yours is a very non-noteworthy experience in life.