He can hit it as hard as he wants, he's still pulling everything
https://www.fangraphs.com/spraycharts.aspx?playerid=1177&position=1B&type=battedball&pid2=1177&ss1=2015&se1=2018&ss2=2015&se2=2018&cht1=hangtime&cht2=battedball&vs1=ALL&vs2=ALL
And here's a comparison (Trout)
https://www.fangraphs.com/spraycharts.aspx?playerid=10155&position=OF&type=battedball&pid2=10155&ss1=2018&se1=2018&ss2=2015&se2=2018&cht1=hangtime&cht2=battedball&vs1=ALL&vs2=ALL
Notice there are a ton less flyballs and popouts on Trout's. Trout also spreads his power out, which Pujols doesn't. The point here is, that although Pujols may hit a ton of hard hit balls, he drills them all into the ground, to the same exact place. And when he's not doing that, he's popping up everything
This isn't something new for Pujols either, btw. It's not like he just started succumbing to double plays as soon as the shift happened; he consistently averages 20+ a year in GDP, which is not great. He averages 21+ GDP per year, over a 17 year career (excluding this year so far). Excluding 2015-2018, he averages exactly the same number, 21+ GDP/year
https://www.baseball-reference.com/players/p/pujolal01.shtml