I guess I just don't see that. perltidy and lint(s) are completely nonoverlapping, to my knowledge. Something that can reformat your code doesn't even do the same job as a linter.
So: a formatter will, for example, make sure your lines are indented to some standard amount of indentation, a linter will bitch if they are not, and both the formatter and the linter should DTRT when they identify certain indefensible coding practices.