Re: support posts for small, low-to-ground deck
that info is out of date actually,
code use to state that you could set a deck on pavers and deck blocks if it was less than a given height AND it isnt connected to the house, meaning the ledger not mechanically fastened. as the frost heave action will lift the deck so much to pull the deck away from the house. However after Hurricane Juan hit in 2003 the codes changed because many decks built that way actually blew over or away.
you can build a deck on grade, meaning grade the yard with 3/4" stone then build the floor frame and simply set it on the ground. this is fine and still gets done. the only extra precation i would take is to drive some galvanized rebar or stakes into the ground within the frame of it so to keep it from shifting around while building it and during the cold season
fire up the saw and make some dust