The original builder and tile subcontractor have stated the hollow tile is not a problem
They are insane and trying to hide from a faulty job and responsibility for the cost to repair the premises.
The inspector stated the only way to fix these issues is to remove ALL tile and start over.
Absolutely correct, there is no other way to fix it.

You can get an inspector from the tile industry to confirm the above if you feel like you want to pay for yet another inspection.
