Thanks for clearing that up. Means we can't pick many actual level 9 spells if we want all the HLAs though. Is it correct we can only choose 4 level 9/10 spells?
So let's say: Dragon's Breath, Comet, Improved Alacrity and Time Stop.
Would be nice to have a few more, but I guess they had to limit it to not make them too powerful.
Nope, as a maxed-out sorcerer you'll end up with 4 normal 9th level spells and all of the HLA spells. The HLA spells don't count towards the spell knowledge limit. You'll only have your normal number of casts per level, but you'll end up with twice as many 9th level spells as any other level.