This just looks like a move to improve the catching depth of the organization. I'll agree with JD that it seems unlikely that he'll show up in the big leagues any time soon. I'd guess that both Ross and Sardinha are in front of him on the depth chart. Perez might be as well.. But as has become my custom, here are some stats:
No idea about his defense.
As for Piste, I can't find a record of him since '3, when he was a young rookie-ball infielder with the Baltimore organization. He signed as an undrafted free agent in '01.