They would not remove reviews unless they had just cause of some type. You can always reach out to support and ask for more clarity. Envato Market Help and Support
Based on item comments etc. you have obviously had a bit of back and forth with it.
It’s fair to argue that a review is about your ‘experience’ - there were also several comments that relate to features etc. that are/were not included with the item, and where the author has gone out of their way to try and politely help and even install the script (which is outside of the scope of support).
This may be connected (again you would need to ask support) to some reviews being removed if it relates to issues related to technical capabilities or features things that were not actually included as part of the item