I am afraid the Filter Query is not supported for Person Field usage.
To work with Person field in SharePoint List through the REST Call, we need to take use of the $Expand function within OData, while currently only the following is supported:
Create a new SLT field that is hidden
Use flow to populate that field with the Created By Name
Filter on that field.
You will need to go through and update the existing 4000 but you could do that with a instant flow also i.e. Get Items, Update Item
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