The Katy article is fake. It's just Australia's way of showing Katy who's boss (tall poppy syndrome) because she's touring here soon and currently has a Coles promotion to sell PRISM for half price. Eh.
Regardless, I won't be surprised, albeit a bit disappointed, if Katy doesn't come forth and acknowledge Kesha's claims. I don't see why Kesha would have any need to "reach out" to Katy though, since they haven't talked for so many years.