From LI help section You can ask us to remove someone from your
Company Page if they don't work at your company or have never worked
at your company.
To file this request, you must have a confirmed company email address
registered to your LinkedIn account.
Provide the following information when you contact us:
The full name of the person. A screenshot of your Company Page where
that person appears. An explanation of why they should be removed.
We'll review your request and let you know when the person has been
removed, or if we need more information.