There seems to be a bit of muddled thinking here.
How are we defining an ‘SUV’?
In Britain, we used to call these vehicles ‘off-roaders’ or ‘4x4s’. The term SUV came from America and was short for sports utility vehicle, the sort of thing you could take into the wilderness to hunt bears. These cars had body-on-chassis designs and all-wheel drive. They were big, heavy, and thirsty and a genuine target for the environmentally minded unless you really needed their capabilities - so farmers, basically!
These days all sorts of cars get called SUVs. Most of them are unitary construction and two-wheel drive. They are basically ordinary cars that are a bit taller. Weight, fuel consumption, and road footprint are very similar to traditional saloons and hatchbacks. There is absolutely no logical, technical reason for these cars to be singled out on environmental grounds.
There are, however, still enormous SUVs with massive engines out there. Stuff like Range Rovers and G Wagens and the like. The lentil tyre people seem to be misinformed. One of the ‘evil SUVs’ in their photos appeared to be a Toyota RAV4 with, very probably, a hybrid powertrain that is more fuel efficient than you’re average Ford Fiesta…