A crypto media outlet citing reddit as their source?, LOL. I wouldn't take this seriously, I don't know why he was invited in that university but I'm assuming the discussion was about economics and related stuff. And as per article:
“Mr. Haldane said it [bitcoin] could replace cash, he even joked about us likely having Bitcoin in our wallets,” the witness shared on Reddit. “He said he didn’t think it’d replace cash tomorrow, but he was quite open to the idea 20 or 30 years down the line. He was also quite familiar with cryptocurrencies and joked that there were now thousands of them.”
So that's the keyword there, obviously he wanted to have a lively discussions and perhaps he just quip that statement to please the crowd, so I will take everything with a grain of salt here.