The reason it sounds wrong is because the tone of the voice for that line has no similarity at all to the rest of the stormtrooper dialog. It breaks the sense of continuity and immersion, and jars you right out of the scene.

I remember the snowspeeder crashing into the AT-AT from the novelization of ESB. The presence of such a scene certainly explains why General Veers disappears from the rest of the movie (since he is apparently dead), as well as why there is a shot of the walker's cockpit blowing up when Luke throws a grenade into it—this shot was meant to have been used for the scene that got cut.

Interesting also is that the rebel pilot named Hobbie is the one who crashed into Veers' walker, killing himself in the process. Hobbie shows up in various post-RotJ novels, beginning with the Thrawn trilogy, since Zahn and other writers didn't know that he was supposed to have died in a deleted scene. I seem to recall also hearing that General Rieekan was supposed to die in the battle as well, which would explain why he's nowhere to be seen in that last scene in the command center and Leia is the only one left in charge. Well, guess who shows up in post-RotJ novels?

The story of ESB certainly is somewhat different when you take all the deleted material into account. The entire dynamic of the relationship between the three main characters changes drastically if the part in the medical center where Luke and Leia almost make out before Han shows up is considered valid.