Definitely an error. Almost certainly uncorrected, in which case the card should be updated with UER in Note 1 and a Note 2 taht expplains the error. I don't collect baseball, but knowing how Panini generally runs their sets, it's likely the same error on all of Marvel parallels...
The error is present on 4 of the variations for which there's a picture in the DB. I'll leave it to someone else to verify that is wasn't corrected, but I'd say the cards should be updated with a Note 2 that reads something like: "UER: Line 6 on the back should reads "HE..." instead of "THE..."