I found this article quite interesting as it adds some much-needed context to the original.
It's mostly saying that, on a per-calorie basis, rice produces notably more methane compared to most other grains but still very much less than animal-agriculture (specifically, cows).
Realistically, rice will continue to be needed as a staple food in many places so it can't be broadly eliminated as a food source. Most consumers who are trying to reduce emissions will be better off looking for ways to reduce their consumption of meat and dairy as it will have a bigger impact.