I think I understand why Yamaha would not want a “bootleg” video of a demonstration being distributed on the internet. A poorly recorded video could give a negative impression of their product.
Yes, they sure wouldn't want anything online that sounded anything like the original PA3X demos. Rembember how everybody was complaining about it? But, I think it would have been wise for Yamaha to record direct so that if it was what they wanted it could have been used.