The real wordsTheory
The claim he says is wrong
One sentence on his slide is set up to be quoted back at you.
"Generally, stocks are risky, but bonds are not. This is not correct. Bonds too carry risks, but the nature and types of risks may be different."
Prof. Panda's note sharpens the point with a definition: risk is uncertainty, and the risk of a financial asset is mainly a function of the uncertainty of the cash flow available from it. Even a GOI bond that never defaults has an uncertain real cash inflow, because inflation fluctuates.