How discouraging, @Nick2112 ! I was reading it the same way you were.
No, @Sarah977 , I don't know the policy. I was able to use my coupon last August when I needed to be out of town for work. But I'd be the same as Nick right now, wondering how and when to use the thing.
I think you have suggested people use them for online Experiences, Sarah, and that makes sense if the system won't let you book when it is actually safe to travel. If you want an Experience.
This is walking on the edge a bit, @Nick2112 , but could you send an inquiry to the host saying you are going to book with them before April 21, but you are going to immediately put in a change request for May 21 and is that okay with them? Worth a try?