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I think he's saying you can now cross the moat "straight on" when you leave the TTC and enter the new level under GO Bay. My assumption is they have built the stairs (or temp stairs in their place) that lead back to the level under the Great Hall (entering at the hoarding near old LCBO). I would wager something like this... orange is what opened today, green is the temporary stairs and leather shop bypass, violet is indicative of the grade change between Concourse (B1) and PATH (B2) levels.
You have (pretty much) got it BUT the current (clearly temporary) route does not go so far 'into' the Bay Street Promenade and as soon as you leave the Moat area you turn right immediately you get into the Union station envelope and link up with the other temporary stairs that have been there for about 6 months.