So it says hes ignores the two hand strike rule for -1 in the to duel role but he doesn't have a a two handed weapon?? I am very confused so does he just have it and cant use it?

The Weapon Master rule has a second part: the model in never considered unarmed. So, should Dwalin fall victim to a Gundabad Shaman's Shatter (or if he is disarmed by special rules or whatever), he would have no penalties.
However, yes. For 99% of the time, having Weapon Master and no 2 handed weapons means you'll gain no advantage from such rule.

Funny that they would have that rule for him but whatever cool looking model not very good tho it seems thank you for your help!

To be fair, as stated, in this instance, it's predominantly to prevent him from being considered unarmed at any point (through spells and scenarios etc).

That being said, it's also because he's a master of weapons and, later in his timeline (and therefore a new profile), he does get hold of a two-handed weapon.