I think it's definitely possible that at least for this season he may not revert to his historical performance. I don't think he's going to pitch like this for his contract, he's better than this and he has five seasons of performances that would indicate that.
But it's possible he can't turn it around this year for whatever reason has led him here, since his underlying numbers aren't really indicating a guy who should have have a better ERA. His xERA is horrific at 5.48, his FIP is only a bit better than that. Only his xFIP shows some hope, but that's not really taking into account the fact that he's getting hit really hard overall. The opposing hard hit percentage is way higher than any other season in his career, he's getting barreled at a higher rate. It makes sense that he's giving up this many home runs. Something is different this year for him, and unless there's a change, there's a decent chance that he'll continue being inconsistent and getting hit hard for the remainder of the year.