My bad. I definitely remember writing it because it's one of the best books in the game for dealing with Gargantuans.
Go for it. Just be wary of things that don't work in 7th. I can't think of any off the top of my head, but I know they're there.Tyrant's Legion list recently (which is now free on FW website, incidentally). I see it's missing from OP too, would anyone be interested in seeing note on that either?
EDIT: One thing I do know is that Codex AM has been printed since then. IIRC, Tyrant's Legion no longer holds up in the slightest. But I could be wrong.