Cremation gets you 9 quanta, no?
9 x 2 = 18
Ruby dragon = 12 
18 - 12 = 6/2 (minor phoenix cost) = 3 minor phoenixes + ruby dragon
What he means is that it takes two Cremations to get a single Dragon, while just one Cremation can get a Destroyer AND two Minor Phoenixes.
Oops. Read that wrong.
I'm still not sure if lava golem + 2 minor phoenixes is better, though...
Your limited to 6 cremations. With golems, you can drop all your creatures. With Ruby Dragons, you can't. Plus the fact you most likely won't draw all cremations, you're hand will become clogged up, and you won't get enough on your field. It's that simple.
