I believe he sees it as poor situational usage. I couldn't tell you if Stef was targeted less in critical moments and games, and I don't have an argument that he wasn't.
But for the offense as a whole, despite the stats, looked a bit out of sorts for much of the year. Or at least had long spells where things looked more difficult for them than I would have expected.
It's certainly possible that my nebulous "eye test" is incorrect fan nonsense, but they sure didn't look as efficient as we've seen them to me. Certainly Josh not taking the short and intermediate options as the year progressed made it seem like a boom/bust operation.