That should read:
"Delta Miles Not Transferable Via Points.com"
I wondered how appalling the transfer rates would be, so I tried asking points.com's exchange calculator. I started with Air Canada, for which it said:
"Exchanges from Delta Air Lines to Air Canada are not currently available. Please go back and select another program. Thank you"
So, I tried every other airline programme that's on their list ... and none of them are available either.