Thanks for your comments. My Steinway and Schimmel grands, instruments this particular tech has babied, both hold their tuning very well in spite of heavy use. I see no evidence of oil deposits on the pins.
Of course, you're right, Dan. I've got to speak to him directly about the issue. He's a member of the guild, a quiet, wonderful fellow, and I owe it to him to get to the bottom of this. Perhaps he was somehow slandered--and improperly lost a huge account (the music dept. at our university is active and large, with many dozens of pianos). I'll get back to you when I find out.