UNIX is proprietary too, and also a kinda large monolith. UNIX philosophy or UNIX way is just the standard lingo to describe using many single-purpose (usually command line) programs to accomplish your task, there's nothing more to it, so this AI tool definitely is UNIXy in this way. I'm not old enough to even remember if that was how folks even actually used UNIX systems most of the time back in the days, but it doesn't really matter, that's just how we talk these days.