Earlier quoted context omitted.
It's actually a "manifest" -- a list of things that are included (well, should be included) -- in any hack event.
I guess he was misled by the URL and title of the document, both of which say Manifesto and not manifest. On a less snarky note (sorry about that), it seems like a good check list for putting together an event I'd like to attend. As someone else noted, none of the demo-parties and hackathons I've attended have ever checked off every box. On the other hand, it might be a cultural thing -- I imagine these events to be…
This checklist seems very centred on the UK hackday format (which I very much enjoy). I've noticed US hackdays have a somewhat different culture, with different expectations, as do gamejams, etc