I didn't check the link (entirely) that you gave. But I know this;
MPEG-2 is what's used for DVD's, not h.264. There are some DVD players that can play h.264 files. But not all of them. I guess the article (since that's most logical) is guiding you to make a DVD all DVD players will read.
I don't know how big the file is, but the file that's going on the disk should be smaller then 4.6GB, but that's obvious of course.
I normally use a preset for MPEG-2 (like 90 minutes) and then another one for the sound and then use DVD Studio Pro to combine them.
Last thing, it's of course not possible to burn an HD movie to the disk. With that I mean that the version the DVD can play will be SD (so a resolution around 640x480).
There is a possibility to put High Definition video on a regular DVD, but only Mac's and a few (I don't know one) DVD players can play these kind of DVD's. You're also limited to about 15 minutes of HD material.
Hope this helps to clarify things. I hope I didn't tell you stuff you already knew.