It is not invalid in one bit. babip against LD% hovers in the .650 range, babip for GB% hovers in the .240 range and flyballs in the .210 range. Someone that can limit LD% by inducing weak contact will have a lower babip than someone who doesnt. Take Drew Hutchinson for example, everyone says hes underperforming his xFIP and hes a better pitcher than that. Look closer at this metrics, hes exclusively using the 4 seam fastball more this year than last, and hes getting rocked at a higher LD% rate ( as his fastball really isnt that good), hence the spike in his babip.
There are some smart cookies on this site, but some of you need to look into the stats a little more than babip is high, hes unlucky. There are underlying factors that help explain alot of what is happening to a player.