To address a few questions I'm sure popped up when people saw these units: no, swords were not exclusive to samurai use during this time and, yes, ashigaru had them too. Obviously these were not of the same quality as that used by the samurai, but cheaper, lower quality loan swords (Turnbull). So while loan sword ashigaru were unlikely to be at the front line of any daimyo's army, they're not the figment of CA's imagination.
I have a question though: where DID they get these loan swords? If this and other stuff was loan equipment, who's doing the lending?