Safari is NOT PUP. The method used by that program to "bundle" the potential installation of some other "software" (in this case, Safari) is also NOT PUP.
Simple example of Potential Unwanted Program: keyloggers. If you have a program that records which keys are pressed, you can use it for your own security, or also to know what the kids are doing ("positive" use in your eyes). But if someone else is using a keylogger to spy on you (meaning, you don't have a clue it is recording you, and you don't know it was installed in your system), the that is a "negative" use of the same program (in your eyes). Hence, the same program can be used for positive goals, or negative ones. Hence, Potential Unwanted Program, PUP.