You can always confirm the DL blackout dates for KE on delta.com by going to the fare rules. That is also where the blackout dates posted here are coming from (directly from DL fare rules, not some third party source), I would think.

Note that it does not kill the inventory - the inventory is still there, just DL blocks it from ticketing, but often you can still select the flights during DL's blackout dates from KE - just then it can't be ticketed and will error out.