The example is from before there were aligned-at-start [well, really they're not: they've passed the initial corruption threshold already and begin with at least 15] archetypes to choose from.
However, re-reading the text, I'll admit its possible to interpret it as "after you've aligned". However, if that's the case, the example can also be taken to imply you need ten corruption points AFTER getting enough advances in order to change or de-align.
Probably best we just stick to the text of the rules then?