In words, this seems to me more like "I need Help, (how) do I return to the main page...?" rather than "Sent me (back) to the main page, (please)."
This becomes even stranger when we look at the menu of the main page, since there is a direct link to the discussion site:
So what's the reason for this incongruity?
Note: As @Shadow Wizard mentioned this is the case in any StackExchange sites and its meta pages. On the other hand, discuss.Area51 is not the discussion site of Area51, but rather for its proposals.