This may be particular to non-British football coverage, because this is all entirely alien to me and I've never heard this ever. It would make sense though, when I played I would definitely fuck around with the keeper during set pieces in the box, and they'd either fight back or a burly defender would be dispatched to keep me busy :-D
I played at fairly high level as a GK (you have to take a word for random guy on HN out of all places saying it) and it was common knowledge or something that was being taught from young age at higher levels.
Maybe I just thought sort of everyone knows it and pay for attention when I hear commentators /studio talking about it. But you can think of it how many penalties, or rather fouls against keeper, they give when keeper jumps into someone inside the six yard box - I don't have statistics at hand but bet tons of money 6 yard box vs penalty area.
