They were certainly hitter friendly but Vlad was the only dude that laid waste to those parks in that fashion. He was legitimately locked in for 5 months of the season and his wOBA and xwOBA values were almost perfectly correlated so he earned every bit of the gaudy statistics by mashing the s*** out of the baseball. On top of that Sahlen Field and TD Ballpark weren't even the most hitter friendly parks in MLB as all of Great America Ballpark, Oriole Park, Coors Field and Fenway were more hitter friendly that season.