There's a misunderstanding of what decentralisation means. The difficulty bomb is in the code but the node operators (miners, etc) have to chose to upgrade the

There's a misunderstanding of what decentralisation means. The difficulty bomb is in the code but the node operators (miners, etc) have to chose to upgrade their clients to work with the new fork rules. The decision of which code to run and which chain becomes canonical is in the hands of the community of users and not the developers, despite the Ethereum Foundation having full ownership of the protocol development process.