While I'm sure he'll adjust you can't just chalk it all down to bad HR/FB luck. Burnes is in the bottom 25th percentile of xSLG, hard hit%, barrel%, exit velocity and xwOBA. He has been hit as hard as basically any starter in the game so far this year. It is a bit concerning. These stats still need a few more games before the start to become meaningful. (ERA takes more than 2 years to be meaningful which is why nobody should use it).