That doesn’t make any sense. How would Silver Surfer be able to maneuver through space at millions of times faster than light if his eyes, reflexes, or “senses” couldn’t react to that speed? He’d crash into a planet, a sun, etc.
He has numerous examples of using his senses to track individual molecules across the galaxy so obviously, his reflexes and speeds are such that he can respond or react to FTL movement.
Not only that, using Thor whenever he’s fighting mortals or on Earth is pretty pointless. He’s always holding back and doesn’t want to kill mortals
99% of the time when he’s on Earth, Thor is holding himself back and he doesn’t even always realizes he’s doing it subconsciously.
it’s why I can post numerous examples of him straight up stating he can throw his hammer FTL
and that he’s able to react to his hammer coming back to him FTL with no issue. His reflexes are FTO and he can swing his hammer FTL.