"Ignore" is a pretty strong word here. This is an analysis of demand. Of course Amazon controls supply, but allowing compute to sit idle at these price points is not profitable so we can assume that they are selling available compute. The question then is whether aggregate instance demand is increasing with respect to available supply and pushing prices up.

You'll have to explain what you mean by "intentional" given raising prices above market equilibrium would leave compute idle (again, very unlikely). In that way amazon is just a market actor (albeit a large one) just like customers.