IMO I dont think there is any question given the way the conversation unfolded between player and caddie the he did indeed test the surface. Now whether or not there was intent is open to question. I am inclined to believe that when he heard Stacy ask if there would be much bounce he just reacted to her question and inadvertently pressed down with his right foot without even thinking about it. Now prior to Stacy asking if there would be much bounce, some of what the caddie did there in the bunker might look purposeful to some people. Im not sure myself. Either way....I think the obvious move he made did test the surface, but was inadvertent and he wasnt intending to gain an advantage to the player.
EDIT: I might add that in hindsight Stacy made a bad decision in asking him that question while he was standing in the bunker. Maybe should have waited until he got out. But in the heat of the moment, shes probably not thinking about the semantics of it all.