lawrence, you point out 3 solid critiques of their action, but none of those indicates that it is not direct action, best i can tell. if they are acting to directly impact their own lives, i'd call it direct action; even if that action happens to backfire or strengthen the state. direct action does not imply smart (to me) or strategic action, unfortunately.
your statement that the action is " in order to fulfill the (dys)function of the municipal authorities... " sounds like an assumption, and a rather large one at that - unless you happen to know the individuals involved and their intentions. that same logic could be used to argue that my defending myself and/or my friends - rather than calling the state - against an aggressor is filling a function of the state/cops, no?
i feel that for "direct action" it has to be simply something that you do without any political baggage attached to it. The crap you do at your job is direct action, even if it doesn't fit into a general anarchist way of doing things. To say that filling potholes isn't direct action is giving the term "direct action" some sort of higher meaning.