From your source:

> Effective pile management and aeration are key to minimizing CH4 emissions.

So it sounds like a correctly managed pile is not a problem.

Also, I have a hard time believing my composting in my backyard is in any way worse than my sending the same food scraps to a landfill.

Thats great that you can correctly manage a compost pile. That level of conscientiousness is a quality that doesn't seem common across the population.

A positive thing about a landfill is that it can take advantage of centralization by capturing biogas created by the large quantities of biodegradable material deposited.

https://www.sciencedirect.com/science/article/abs/pii/S03603...