I’m not going to bicker back and forth with you on this statement but it really seems false to me.
You do know that most any DMM that can measure mains should have a fuse for safety,
my Fluke 87V does and thousands of people rely on it daily.
If it doesn’t have a fuse it’s considered very dangerous and poorly designed.
I realize its not a appliance but maybe that statement is just worded all wrong.