Changes coverage down field to an extent to man coverage in these situations?
That is not really how I interpreted it. I didn't think they were talking about blitzing per se, but rather personnel usage. That is, perhaps Hitchens lines up at DE in obvious passing situations, and some less-explosive DL goes to the sidelines to be replaced by a DB or another LB. Or, as we have seen at times in the Ferentz era, perhaps they play 3-man line, go nickel, and send one of the 3 LBs as well.
Either way, there would be no necessity to play man because there are still 7 in coverage. Just the way I interpreted it, I could be wrong. That said, Iowa played a lot more man last year than previous years, and that could continue. I do think their safeties can be abused in man, so it is a bit risky.