I'm not sure why you think that. Is it because the anthology makes it look as though score reading is a key element? I don't think it is and, while there is much to criticise about Edexcel (as with all boards), the fact that the listening paper is based on just 12 excerpts makes it by far and away the easiest of any of the GCSE specifications. The questions are very predictable and there's no worry about question on anything unfamiliar - even the few short questions requiring notation are based on the 12 excerpts, and not on unfamiliar music. Perhaps not ideal educationally, but a good option when time is short.