Commanding a homunculus is not like commanding a spirit. A spirit is intuitive and intelligent; a homunculus just follows orders and becomes frustrated when the task becomes impossible.
That makes it pretty clear that homunculi don't think.
Now, the real question is: Which part gets Errata'd out when/if we get the Core book errata?
The fact that homunculi only follow orders and can't think there way out of a cardboard box?
Or the Sapience power?
Like how many licks does it take to get to the center of a tootsie roll pop, the world may never know.
Neither. "Don't think" is not the same as "not considered an example of intelligent behavior."
In your quote, spirits are described as intelligent. Like when describing people as intelligent, that is saying spirits possess above average or exceptional intelligence (and the same for intuition). Contrasting that with homunculus means that the homunculus is average or less. I think with 1 intuition and logic, it may be the least intelligent non-metahuman with sapience, but that is still in the range of metahumanity.
This means you can tell a spirit to do something and it might figure out unclear instructions, question why it should be cleaning your cat's litter box, or explain to you why your existence is ultimately pointless while it smacks around security guards for you.
A homunculus will not question it's purpose or puzzle out how to work around a problem. It might be dumb, but it has sapience and is not lacking intelligence; it's just not the sharpest tool in the tool shed ... unless you made it from your best axe.