Failing this as an issue, other aspects of usage can be criticized in the same way. The target's speech is attacked for failing to match that of one's own family elders. It may match the speech of the speaker's own elders fairly well. Mistakes are easier to hear when you're looking for them. Older usage is attested in texts from the 1880s, with some signs of modern usage.
Modern usage is found in current speech.
Omahas note that male characters in old story songs seem to be talking like women. The perception of feminine speech in songs occurs because the male sentence-final sequences have changed systematically, and the older forms retained in the songs are remiscent of some modern female forms. Story song texts generally seem to be more conservative than the surrounding story text. This was true even in the past.