I don't get that impression at all. The receptacle must be rated for at least what the circuit is rated for. So a 30 amp circuit would require at least a 30 amp receptacle, with the 2 exceptions that follow the article.
Also, take a look at table 210-24 on the next page. This makes it clear that a 30 amp circuit shall have a 30 amp receptacle (no other size) except as noted in note 2.