Hi,
I have absolutely no clue where WordFence gets this information unfortunately. I guess it can’t access a file date or fetches it incorrectly?
There is no such thing as “last updated” date for commercial plugins, so I can’t set that explicitly.
First thing to try is to download the plugin from codecanyon and reinstall it again (Download -> Deactivate via plugin manager -> Delete via plugin Manager -> Upload & Install via plugin manager). That may refresh the files to the correct date.
Deactivating and deleting will not remove any of the plugin data, so everything will stay as it was before.