No, like the grandparent mentioned it says more than that.

If you have a project that takes one engineer ten months, then you can't finish the project in one month by assigning 10 engineers to the project, even if they all start working on the project the same day.

You can't even take that 10 month project and turn it into a 5 month project by assigning 2 engineers from the first day.

The networking and communication problems the grandparent mentioned are about how much more efficient it is for one human brain to keep track of the project than it is for more than one. The more people you throw at it, the worse it gets.

So the statement "10 engineers can be 10 times as productive working for a year as 1 engineer." is false. Presumably the team of 10 can get more work done in that year, but because of communication overhead it will be less than 10X the output of one engineer. If the group dynamics are terrible, it may even be less than the output of 1 engineer. (I'm reminded of http://thedailywtf.com/Articles/The-Strong-Type.aspx where the source tree was deleted during a team fight.)

Of course, how the two situations will compare will vary. Some teams work better together. Some projects require a range of skills only available from a range of people. But the networking & communication problems decrease efficiency.

Symbolic links to directories are fine as long as you use junctions (available in WinXP) instead of symbolic links (available in Win7 (Vista?)).

Symbolic links (not junctions) to files or directories are recommended as prohibited, and Win7 seems to ship that way:
http://technet.microsoft.com/en-us/library/dd349804(WS.10).aspx#BKMK_16