The site gives +20 positions, but when you click them, you'll see that most patterns are roughly the same, sometimes even separable by 1 note.
Patterns are officially not predetermined anywhere, they are just a tool to help you remember the scale. The patterns you can find in Andrew's theory lessons are used by most people because these patterns are the easiest to remember by most people, but by no means a law. Pentatonic has 5 notes, and usually got 5 patterns derived from that scale. Diatonic has 7 notes, and gives us 7 patterns. If you want, you could play these patterns the way you want, starting from any given note. Seeing as there are a lot of notes on the fretboard, this gives many different positions.
Anyway, I would recommend you to learn the basic 5 positions from the pentatonic, or the 7 from the diatonic given in Ivan's Pentatonic and Diatonic Workshop Lessons.
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