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Hair, J. F., Hult, G. T. M., Ringle, C. M., & Sarstedt, M. (2017). A Primer on Partial Least Squares Structural Equation Modeling . write on page 112: Values above 0.90 (and definitely above 0.95) are not desirable because they indicate that all the indicator variables are measuring the same ph...

Well, you are here at the heart of measurement theory. Taken as it is, the sentence is wrong. You want all your items to “measure the same phenomenon” in a reflective model. Otherwise you don’t have a unidimensional constructs. Practically, the authors point to a problem that often occurs in empiri...