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No it won’t, this is a persistent myth for some reason. Good results at one and two stops over, then you get a marked increase in graininess with further overexposure. Look up H+D Curves if it’s not obvious why.
platypus-
Suppose it depends on what you consider "good results", but still I would argue that one could easily shoot Portra maybe not 7, but easily 3-5 stops above box speed depending on the situation, and nobody would even know if you didn't tell them if they looked at the actual images and not at some curves.
salad
Porta will tolerate 7 stops over with good results.