I've been hoping someone who has read the ruling would come by with more detail if there is any on their justification. IIRC this case had lots of scientific evidence proving skill and only "opinion" from prosecution witnesses to refute it. (I might be confusing this with the other Pennsylvania case that went against us in a jury trial.)
If I'm seeing this correctly our mixed results in Pennsylvania is the struggle we face in using the skill vs chance argument. I could be summarized as "lots of people are stupid."
Despite the many and constantly increasing scientific studies showing otherwise they have a hard time seeing beyond the obvious chance element. If they've never played or, probably worse, played a handful of times where they would have lived or died by the cards as most new players who don't know how to fold would this is somewhat understandable. They've got to see it to believe it.
One thing that might be do is an actual demonstration of how it can be done. Something like what I think Mike Sexton did when he testified in one of the cases (South Carolinia, maybe). Among other things walking through a series of hands from a televised tournament and discussing the thought process of the various players and how skill influenced the outcome.