I was under the understanding that "Basic" award seats with Delta are not refundable back to miles.
But today I was reading on social media someone's experiences with booking a few one-way Basic flights with Delta from the U.S to Taiwan, and they said they were able to cancel for a full refund.

So I'm wondering whether I misunderstood some things I read a year ago about Basic award tickets being non-refundable, or perhaps there has been a change?

Of course, I'd prefer Basic to save some miles if it really can be CHANGED and fully CANCELED for free. But I was thinking it was only Main and up and that was changeable and refundable?

Tia!