The problem is that the words "isolation transformer" are used to describe to diferent things:
>> An isolation transformes to give an "isolated" enviroment so you can service line operated devices, use grounded test equipment, etc. (This is what most of us are thinking when we say isolation transformer)
>> A surge protector used to power sensitive equipment (computers), and that happens to be a transformer. They call it "isolation transformer" because it isolates the load from the line's noise, but it doesn't provide earth isolation.çç