Because these are not the same, and mean different things:
array( $this, 'method' )=$this->method();array( 'classname', 'method' )=classname::method();
One calls a method on an object, the other calls a static method on a class.
Since what you’re trying to unhook is not a static method, you need a reference to the object, hence why your second example works, and the first doesn’t.
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