Yes, or less than ten for high end desktop/servers, possibly far less than 10. Fluffypony showed that 10 servers could mine the whole thing in three months. Spread that out over two years and its just one or two servers. A reasonable hash rate for a desktop is 200-300 H/s so that's 4-5 computers. With a mix of smaller computers it might be as much as 10.

So these alleged "mining teams" all over the world had a grand total of <10 computers?

Sorry but no.

The story is a complete fabrication.