## This should work

The infusion feature says

> Whenever you finish a long rest, **you** can touch a nonmagical object and imbue it with one of your artificer infusions, turning it into a magic item. An infusion works on only certain kinds of objects, as specified in the infusion's description.

You are the one infusing the item. If the item has the thrown property for you, then it meets the conditions for you and you can infuse the item. This wording is about a clean as it can get to make it clear that the weapon counts as a thrown weapon with the property for you and your class abilities, [instead of just mentioning a "thrown weapon"][1].

The "for you" restricts this to your actions and abilities. Another Artificer would not be able to infuse the item, as it does not have the property for them. There is no other interpretation of this language that makes sense: If the "for you" would mean that it somehow does not have the thrown property for you, then that aspect of the feat *would not do anything*. 





  [1]: https://rpg.stackexchange.com/q/208705/75095