"Outside arm there. It looked a bit suspicious."

The Sharks throw in at a line-out. Bismarck du Plessis throws in and Alistair Hargreaves goes up for the ball. With his right hand he knocks the ball down to Charl McLeod and the Sharks attack.

The commentator wonders about the use of the outside arm.

When Hargreaves goes up to play the ball he has both arms up, but chooses to uses only the right arm.

Law 10. (j) Catching or deflecting. When jumping for the ball, a player must use either both hands or the inside arm to try to catch or deflect the ball. The jumper must not use the outside arm alone to try to catch or deflect the ball. If the jumper has both hands above the head either hand may be used to play the ball.
Sanction: Free Kick on the 15-metre line

Hargreaves was allowed to play the ball with either hand. There was nothing suspicious there at all.

The commentator probably remembers a law change in 1992 when Law 23.16 read:  A player jumping for the ball must user both hands or his inside arm to catch or deflect the ball.

The reason for the change was to eliminate the nefarious use of the inside hand by the jumper.

That remained law till 1996 when it was changed to read::  A player jumping for the ball must do so with either both hands or his inside arm to catch or deflect the ball. When a player plays the ball with both hands above his head, he is allowed to use either hand.

The commentator would have been right - 15 years ago!  Since then Hargreaves has been above suspicion.