4.5% Interest on Gold and Silver?

In Odd Twist, Canadian Bullion Dealer Offers To Pay Interest On Gold And Silver

4.5% interest appears too good to be true in a world immersed in 0.4% gold lease rate, ZIRP, 0.25% USD interest rate and NIRP. It's a good deal anyhow if there is nothing sinister behind it. This shows that for CBS to be willing to pay an interest of up to 4.5%, it found a way to profitably utilize such gold holdings with higher yield. However, knowing the history of gold, India's recent failed attempt to lure its people to hand their gold into govt safekeeping and the current state of Canadian economy, I am suspicious that this could be a precursor to a subtle form of confiscation, a Canadian version of FDR's EO 6102.