Is there an ETF in US funds that you would buy now? Yes. A classic one would be iShares Core S&P 500 ETF (IVV-N). Cheap, low cost, liquid. He would be careful with the low vol or low dividend. He prefers the pure beta. 

He recommends iShares Core S&P 500 ETF (IVV-N)  because it’s cheap , low cost and liquid.