No. They mean you have to have it enabled in your BIOS. If it's not, you cannot run 64 bit VMs. Even the older Atlas VM's required this though, so if you've been running just about any other VM based project successfully, you most likely already have it set.

When I was first getting my hosts set up, a quick way I found to verify it is to simply start the process to create your own VM. "Machine->New" if the "Version" option lists a "(32-bit)" version of Windows first, and you can't find any "(64-bit)" options in the list, you don't have VT-x enabled.