Right-handed hitting is one of the two ways that switch hitters hit. So if he saw Acuña hit once, he could assume he was hitting one of the two main ways switch-hitters hit. The people invested in criticizing every single move find this latest chapter "very concerning". Those who don't care understand that people have brain farts, sometimes over the course of a week. If he kept calling him Ronald, then was surprised to find it wasn't Ronald Acuña, yes, that would be concerning. If an old woman named Luisa Angel Acuña showed up to Sox camp ready for the batting cage, that would also be concerning. Neither of those troubling mistakes happened, however.