I read about this topic while I was reading about 51% attack. I would say dPoW adds one more security check to PoW by taking backup/snapshot. That is every 10 min the Komodo blockchain network takes a backup/snapshot of the blockchain and stores this snapshot in an block of bitcoin network. This process of taking a snapshot and storing it in a block is called notarization. Once the block is notarized it cannot be changed which makes the blockchain more resistant or secure from 51% attack.

I had read that this is currently implemented in Bitcoin. I still have confusion that if this was that useful why are the other coins not implementing it? I think dPoW can even prevent Tx malleability issue not sure about tx malleability.

You can read more about dPoW in below articles:
https://blog.komodoplatform.com/delayed-proof-of-work-explained-9a74250dbb86
https://www.binance.vision/blockchain/delayed-proof-of-work-explained