That’s how he refers to a forward, non-breakaway throw.
In competition, people get variety points by having variety. A freestyle with good variety will have vertical and horizontal, frontstyle and sidestyle, and slacks and non slacks.
Granted not all your tricks are frontstyle, but they all start with a forward throw; I don’t know if judges will care about that though.
However all this talk about competition is besides the point, I think. This is a video not a freestyle. For me, seeing somebody throw forward all the time is somewhat awkward because I’m so used to see breakaway throws. I also feel this way when I see left-handed players throw. I think this is what stuart is saying. It’s not really awkward; weird is a better word.
Back to the competition point, your frontstyle throw might actually gain you points. Mark Mangarin once told me that lefties tend to score higher because their tricks are reversed and even generic elements look original. I think that your forward throws might have the same effect.