Yeah but typically you can grab a disk and do a clean install from 10.0 to 10.5. He's saying that now you have to do a clean install from a disk to get to 10.5

Yeah but typically you can grab a disk and do a clean install from 10.0 to 10.5. He's saying that now you have to do a clean install from a disk to get to 10.5, and then MAS 10.5->10.6, which is more work.