How does it show that? Historically Democrats have had huge advantages in early voting (certainly in FL), something that will be even more this year when Democrats have been pushing early voting and Trump has been talking it down.
Obviously it's not conclusive evidence, but assuming Republicans in PA are as likely to vote early as they are in WI, MI, & OH, it would indicate there are proportionally far less R voters in PA. In truth the spread is too large and there must be a better explanation.
Florida numbers are only mail-in, since in-person didn't open yet so I understand why the numbers are more skewed D, but PA is a mystery to me.