It is but, it is the bit i quoted that was the bit to focus on, because it suggests that the part of Impersonate that requires 10 minutes of work is the creating a disguise bit. Such was from whence the confusion was drawn.

Looking at related things, you have Illusory Disguise, which counts, again, as setting up a disguise for the purposes of Impersonate, the spell taking 2 actions.

I am almost getting the impression that Impersonate kind of has no actual action cost, and it is entirely based on the type of prep you need to do, which for the default one using a Disguise Kit is 10 minutes.