Is Harrington wrong here?

[Keyser.]

I don't think it's simply an error since he even explains why it is correct to call your remaining 400 when the BB pushes on a bricked flop.

[seke2]

I guess he's just saying that your chips are going in anyway, so perhaps that raising and leaving yourself a small amount behind is scarier than just pushing all-in, so you might actually have more fold equity that way. I could see that if you were playing in person and had shown you were a solid player, but online, when I see that sort of crap, unless I have a read otherwise I assume the other player is an idiot.