I heard that, and he did say infield, but I’m not sure what his point was. Brennaman (I think) suggested that nobody plays long toss anymore. The one recent exception, he said, was Steve Finley, who I don’t recall having an extraordinary arm or stockpiling assists, so I fail to see how that can really be the culprit.
I think the high-offense, TTO baseball in this decade is the most likely culprit, as guys strike out more often, while baserunners may be less likely to take chances than they would in a lower run-scoring environment.
Either way, it was pretty interesting that outfield assists are lower this decade than any decade since the aughts or teens. Too bad they couldn’t really delve into it with more sensible theories (I’m sure there are other possible explanations), though I suppose that would be asking too much from Tim and Thom.