I had no idea what corned silverside was so I had to google it. Turns out it's the exact same thing as corned beef, corned brisket, etc.

It's still beef like ground/steak, however the brisket is a fattier cut and wouldn't be ideal for a BB'ers diet IMO. Also, the corning process is just that - a process, meaning the food isn't in it's natural state. Corned beef is generally loaded with nitrates/nitrites... these are nasty and have no place in a healthy diet.

Eat it as a cheat meal, not daily.