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Every hitter has a bad month. I remember when Miguel Tejada in his prime went a month without a homerun. Not sure why that would make you skeptical, then again everyone freaks out when Ichiro bats .280 in April.
As for his numbers against southpaws, that's just nitpicking. It's a small sample so you should expect that to fluctuate a lot. At age 22, Jim Thome had better numbers against lefties than righties; the very next year he was atrocious. Doesn't mean anything. Besides, he's young and so he has plenty of time to get better there. Anyway, even if he never improves in that department, if he slugs .600 against righties I won't complain about a near league average OPS against the occasional lefty.