It's obvious why he suggested it to prevent having contact with money that a lot of people had previously own. This brings a chance for cryptocurrency to be recognized by the government. Suggesting less physical transactions means that cryptocurrency can help with that. To avoid having contact with different people, we can use cryptocurrency for transactions that we don't have to touch any paper money or even have close contact with the people we're having a transaction with.
I think cryptocurrency is far from the first thing that comes to the minds of government when they hear "contactless payment" - they would likely think about bank cards, PayPal, GooglePay and so on. There might some small chance that it will indeed lead to crypto recognition, but I think at times of the crisis no one will have time to think about crypto. And potential adopters might be scared off by crypto's volatility, as we see that crypto markets aren't doing well now.