Hi Lyss,
It depends on how this information is stored. If the visibility is set as a user meta, then it might be even possible to create hidden user meta filter, that would automatically exclude the items.
If the plugin has an API (function) to check if a user profile is private, then using that in a small custom code snippet would also work.
Feel free to ask the plugin developer and let me know, there is definitely a way to do it one way or another.