It's not just the puck moving, its how much Detroit's defense and centers spend below the dots when Howard is in net. It helps limit high percentage chances and rebounds, but it also makes breakouts harder because it gives the other team more time to regroup in the neutral zone.
Are you able to demonstrate this at all? Because honestly, I don't see it. I've watched the Wings play with Howard and other goalies for a long time now, and it's not like "Oh, this is a HOWARD GAME. Look at that strategy shift!"
People said the exact same thing when Monster was here, getting insanely high goal support. It's all random variation. The kind of thing that could easily be chalked up as statistically insignificant, if you're into actual stats. The Wings offense is not great, so things tend to ebb and flow because they don't have any elite players. Looking to the goalie to explain the offense... I dunno, man. It's a pretty big reach.