Wood is edible when processed correctly, but it's not legally considered "food" because there are a bunch of nontrivial steps to get it into that state. Likewise, any reasonable interpretation of "general purpose computer" in this context by a judge would not include your microwave oven just because someone with skill and finesse could transform it into a cursed Doom arcade machine.

Laws are interpreted by people trained to fill in the blanks[1] with a best guess of the legislative body's intent. And the intent here seems pretty clear: to regulate computing devices that let end users easily install software from a centralized catalog.

[1] which we all do subconsciously in day-to-day speech, because all language is ultimately subjective