This is a little like asking whether observing a grain of sand is evidence that beaches can exist. (Yes, but its really not the sensible thing to ask.) The Higgs particle is to the Higgs field as the photon is to the electromagnetic field, or the electron is to the electron field. You've heard of the electromagnetic field because it's a boson and so can pile up into macroscopic amounts such that the particle granularity is negligible. (Electrons are fermions so they can't.) In principle the Higgs can do this too, but presumably the energy required to create a macroscopic Higgs field is unimaginable.