Who paid the "expert". Many times their conclusions are based on who is footing the bill.
The use of nails to support the box is a standard practice. Some boxes come from the manufacturer with pre-installed nails that are crimped inside the box so that they can't fall out before the box is installed. Where was the freezer installed? Most of the time GFCI protection would not be required.
Don(resqcapt19)
