OK. Shuckbergh must be an outlier, I'll go with the majority of translators and plump for Laodicea on Lycus. Thank you!

A possible explanation (4) is that Shuckburgh fell asleep at the wheel and just wrote 'Apamea' when he meant to write 'Laodicea'. This certainly explains why he has no need to justify the change (it's not in the list of emendations at the beginning of the work).