Illegal Forward Pass Ruling in SD-PIT Game

[SportsFan]

Here's what the NFL.com play-by-play says:

1-10-SD 21 (:05) (Shotgun) 17-P.Rivers pass short middle to 21-L.Tomlinson to SD 24 for 3 yards. Lateral to 89-C.Chambers to SD 26 for 2 yards (43-T.Polamalu). FUMBLES (43-T.Polamalu), RECOVERED by PIT-43-T.Polamalu at SD 12. 43-T.Polamalu for 12 yards, TOUCHDOWN. The Replay Assistant challenged the backward pass ruling, and the play was REVERSED. (Shotgun) 17-P.Rivers pass short middle to 21-L.Tomlinson, dead ball declared at SD 26 for 5 yards. PENALTY on SD-21-L.Tomlinson, Illegal Forward Pass, 0 yards, enforced at SD 5.

After the review, the referee (Scott Green) seemed confused as to the ruling, initially stating that the touchdown stood. Right before the extra point attempt, all the officials got together. Then, Green ruled that there was no touchdown and the game was over.

The pass in question was attempted by Tomlinson and caught by Chris Chambers. Is it correct for the play to end there?