How do the new Deathknell changes affect Kog'Maw's ability?

Ruling: The new Deathknell rules fix Kog'Maw so his ability now correctly resolves. Previously, "my battlefield" was invalid when Kog'Maw was in trash, but now the game remembers his original battlefield before he dies, allowing his damage effect to work properly.

Sequence:

• Deathknell abilities pend before units are killed by damage
• All units heal
• Units die and Deathknell abilities finalize (or come off the chain if death was replaced)
• After cleanup, a chain is created with all Deathknell abilities (but not Conquer abilities yet)
• Normal non-showdown priority rules apply for this chain
• Deathknell abilities resolve
• When the chain is empty, control is established and Conquer effects happen

Nuances:

• This is technically a huge buff since Kog'Maw didn't work before under strict rules interpretation
• In practice, players already played him as if he worked this way (or didn't play him at all), so functionally nothing changed