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Also, the original post here referred to 404 errors, not redirects to channel pages. That sounds like a server glitch, not the result of a guidesite being eliminated. (As far as I know, missing guidesites--or even missing pages within a guidesite--always take users back to the About.com home page, channel page, or individual site home page instead of returning 404 errors.)
but, i think there's been more resignations since then... i digress...
Anyhow, you're right, i don't think I read the original post correctly maybe i was thinking of a custom 404 situation where if you didn't find the page, it would automatically redirect to the channel homepage.
maybe it is something they're playing with on the servers then i don't know.
FWIW, google will revert back to some pretty old material when it's in the middle of an update, so it's not unheard of to see a cached page several months old. I caught one of mine a couple of days ago.