>unless it was way worse than the homeowner was claiming here and lit up like a big grassy knoll.
The author is cagey about the extent of the moss growth. He brings up that "A small amount is largely harmless", but for whatever reason refuses to connect either parts of statement (ie. "small amount" or "largely harmless) to his roof specifically. The only thing we know about his roof is that "the moss was dying". My totally unfounded speculation is that the moss growth was actually pretty bad, but he didn't want that to get in the way of his 1500 word article about how companies are using AI to oppress consumers.