Well it depends on what role a PMC has within a company. If they are, like you say, just someone that gets to have a well paying job within the company then yeah they aren't the petit bourgeoisie, but to me the term can also mean mid level managers, i.e. a stage below owners/shareholders/executives who represent the bourgeoisie, but who do not rely on their labor for income, instead relying on placing themselves high enough above the proletariat to reap benefits from being a lackey to the bourgeoisie in the form of managing the proletariat, which I would classify as petit bourgeois. However I also think this distinction is not that important when analysing the overall relationship between capital and labor.
Well it depends on what role a PMC has within a company. If they are, like you say, just someone that gets to have a well paying job within the company then yeah they aren't the petit bourgeoisie, but to me the term can also mean mid level managers, i.e. a stage below owners/shareholders/executives who represent the bourgeoisie, but who do not rely on their labor for income, instead relying on placing themselves high enough above the proletariat to reap benefits from being a lackey to the bourgeoisie in the form of managing the proletariat, which I would classify as petit bourgeois. However I also think this distinction is not that important when analysing the overall relationship between capital and labor.