In episode 1e08, the Mandalorian meets the armorer again and has this exchange with her:
Armorer: It looks helpless.
The Mandalorian: It's injured, but it is not helpless. Its species can move objects with its mind.
Armorer: I know of such things. The songs of eons past tell of battles between Mandalore The Great, and an order of sorcerers called Jedi that fought with such powers.
How does this exchange make sense?
The series takes place a few years after the fall of the Empire. So Luke Skywalker should be a well known figure and probably in the process of training new Jedi.
Even if not, the Mandalorians fought in the Clone Wars, where Jedi were still a somewhat common sight. During the the time of the Empire, Darth Vader and Emperor Palapatine were prominent figures with similar powers.
A Mandalorian joined the Jedi order 1000 years ago, why is such an event unknown to the armorer?
Surely, a learned figure in their community like the armorer knows more about Jedi than tales from a war, which happened thousands of years ago.