this new study which "suggests there is no evolutionary disadvantage to being a lefty ..."

Is that what it said?

Extract:
"Faurie plans to continue working to understand why left-handedness might have persisted in the same proportion for such a long time.

'I'm trying to show the possible advantages associated with being left-handed,' she said."

It may be that whatever the disadvantages of being left-handed, there may be compensating advantages.

For instance, it is said that left-handers have superior spatial skills as reflected by higher batting averages in baseball based on the relative percentage of left-handed hitters in the professional game.