On the next page, however, they sneer at Alan Garner from a great Oxfordian height, finding it 'curious' [i.e. incredible, in Oxford-speak] that he managed to come up with 'lore-master' in The Weirdstone of Brisingamen when the only precedents were the medieval poem Cursor Mundi and Tolkien's The Fellowship of the Ring. Curious, that is, if (as Garner has always claimed) he had not read LOTR before writing his own book. But both 'lore' and 'master' are common words, so by their own rule this argument is pretty lame.
As for whether Garner had read LOTR, that's another matter (which I've discussed already in Four British Fantasists). There are plenty of similarities between the books, for sure, but I'm less inclined than many to see that kind of evidence as conclusive. I've heard about, and even experienced, some pretty weird coincidences of a similar sort, and on the whole I'm inclined to take Garner's word for it.