Lawrence: the point of ETTR is to expose as highly as possible without blowing the highlights.
If your camera can't accurately predict when the highlights will clip, then it's probably not the best technique to try; but if the camera does allow you to predict it, maximizing exposure while staying below the blowout limit is pretty much ETTR.
If your camera does allow you to predict when highlights will blow but you're blowing them anyway, you're not ETTR'ing, but just throwing away information.