There is no doubt that this is new stuff, created using AI, and not really claiming to be older. But they imitate the old sound, except for the lyrics, which are "explicit" in a way that does not match the period, including genuine banned songs. That's the funny thing, not the bawdiness as such.

The remaining question is: To what extent and in what way were humans involved in composing the songs. My experience is that AI music is typically much worse, and lyrics tend to be not much better. This experience may now be challenged.