If memory serves, the SALT team has/had made some progress.
I have a vague recollection of
@shinyquagsire23 saying that those on 9.5 should make a NAND dump and to not update past that point or they'd regret it.
I'm not sure if the progress was made by Shiny himself or
@WulfyStylez/
@Dazzozo.
Not that it matters, it went from "we're probably going to disclose it", to "we're unsure if we're going to disclose it", to "we're not going to disclose it" in the space of a couple of pages.
(Which was absolutely the right choice in my opinion, it's pure shortsighted stupidity to burn exploits unnecessarily)
That's the one, and only, time I can recall anyone hinting at 9.3+ exploits being discovered.