As you say, they created a bunch of money. But also, we have less stuff (because when all those people who weren't working, they weren't doing whatever they normally did, and so there's missing output in the economy). So, more money and less stuff, and what do you know, we have inflation. This is my complete lack of surprise.

But, if we stop creating more extra money, and if people can return to work, then it should be transitory. I don't see reason why we should expect 5% inflation every year going forward.