Hmmm. I interpret that differently. They are only talking about moving data - i.e. emails from one Gmail account to another. Not moving an actual product instance.
Ah, dang, so what to do? I have important products spread out over two sites. Just leave em? What's up with this site? I have to log in on each post?
Yes, unfortunately over time I made two Google account, (which have 2 different log in), don't ask me why! Would love to get 4 products from one over to the other and shut one down.