Ignoring the ambiguity of the word "refuse", that often means "turn into trash", it's also completely redundant with "reduce". To the point that it doesn't add anything new.
I hadn't heard the "rot" one, but I imagine it's referring to composting. We have a county-run composting site (https://www.princegeorgescountymd.gov/departments-offices/en...), and apparently when done right it produces a whole lot less methane than letting organics get buried and decompose in landfills.
There is overlap but I can see some distinction. Refuse might be simply not in first place buying some product group say a smartwatch. Where as reduce would be buying one but updating it less often. One could argue that refusing entire products is easier than reducing use.
