It is really confusing. Priam is sometimes called Dardanides (son of dardanus) but never Dardanoi, or Dardanion, or Dardanos man, etc, which is the specific tribe/house that Antenor, Aeneas, Acamas, etc, belong to.
Here below are all references to Dardan- in the Greek, from book 22 there are only 3 references, once for Priam as Dardanides, and twice for the Dardanian gates as Dardanion. So that "Dardan hero" from your link I am assuming is a bad translation, of somebody that didn't see it as being significant and just considered it interchangable with Trojan, as majority do.
It is strange why Priam is sometimes referred to as a son of Dardanus (Dardanides), but never stated as part of the Dardanoi. Hector leads the trojans, and the Dardanoi at one point in the Iliad are placed in the back, and Aeneas remarks angrily that he is not a descendant of Laomedon like Priam.
This is Grace Macurdy's hypothesis about why Priam is sometimes called Dardanides (son of Dardanus):