Yep, he had a strong dislike of the practice of blending single malt with "grain whisky":
"It was nothing short of a sin against the light to lump malt whisky with neutral industrial spirit as if it too were something to burn in lamps, to drive engines or to clean clothes."
Not a man to mince his words!
(and I'm sure the SWA would be happy to see that he refers to vattings of different malts as "blended malts" - which was, I think, quite common before the term "vatted malts" caught on during the second half of the 20th century )
I'm off to pour a dram and read some more.