@jullatguard: That's just a statement like Thanos being considered the strongest in the Universe.
But who those statements come from matter. The thanos statement came from a grunt kree who wouldnt know the powerlevels or even existence of every super powerful being out there in the stars like hela, or ego, or thor, odin, celestials, yada yada.
The other statement is from the guy who makes Asgardian weapons. We know dwarves forge for Asgard. He made mjolnir. He would certainly know what weapon Odin used. And he already had the mold of stormbreaker ready to go for the king. He knows what Asgard has. Even the magic of the bifrost isnt foregin to him. Id take his word for it more than blanket statements from lesser more ignorant characters.