I'm an English teacher though not KS2.
The only thing that I'd say looks "difficult" is the length of the extracts. The questions are fairly simple if the kids have been trained to understand what the question is looking for. (haven't read them all, but most of the first ones are looking for the parts of the extract where opinion/emotion is expressed rather than detailed/specific information etc) They should also have been trained in skimming/scanning techniques, looking for detail, looking for general meaning and inference.
These tests are nothing to do with reading or love of it. They're testing the use of English language and ability to understand what a writer is trying to say.
I hadn't realised there'd been complaints about this particular test. Looks to me like it's a simple "we don't think SATS are valid" complaint tbh.