Title text:
It does come at the cost of some launchpad expansions and increased fuel requirements, but that all comes out of the facility's budget.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3291/
The giant chemical engines were not being compared to the alcubierre drive. The commenter was discussing how the engine of the ship in futurama, which "moves the universe around it" would fairly neatly describe the function of an alcubierre drive in layman's terms. This is why you were downvoted.