yup, it is, you can't change the aspect ratio on it. The maloofs have been broadcasting it on HD on 31 and 10 this way the past few seasons, if you can get the HD station. You can definately tell if it isn't HD. (blurry little heads running around, with little detail.)
I heard the comcast station is only broadcasting home games on HD, but this isn't though comcast.
Can you even get "true HD" through comcast cable?