FWIW, I suspect the 'rumor' is true, for several reasons.
Kia hasn't been advertising or giving any real marketing support to the Stinger for a while. It's clearly an anomaly in their product lineup. Most Kia dealers and salespeople don't know what to do with it.
I think part of the reason Kia hasn't supported the Stinger is because of Hyundai's fear of cannibalization of Genesis sales. The equivalent Genesis costs more than the Stinger, and Genesis is Hyundai's 'premium' brand. The high-end Stinger was always a fish out of water at Kia, which is their corporate 'bargain' brand (even though I personally think the Stinger is much better looking and a nicer car overall than the
G70).
I think the company never really thought through how to position the Stinger as part of Kia. The Genesis line was launched before the Stinger appeared in Kia's lineup. As such, it never really made sense - to have a higher end, near-luxury, high performance car stuck in a lower-price franchise? It would have made more sense to brand it a Genesis.
As
@CDv6 said, Kia has the K5, a car that looks a lot like the Stinger, but with FWD only and a 4 cylinder engine, along with a lower price, fits in more logically than the Stinger did.
Lastly, 'sedans' are not popular in the U.S. market. In this country it's all CUV/SUV's all the time. Ford even discontinued all its passenger cars in the U.S. (except for the Mustang, and even there they introduced the Mach E EV SUV). It's hard for any sedan to make a business case, let alone with all the confounding issues facing the Stinger.
I personally don't want a CUV/SUV. I'm thrilled I was able to buy a Stinger, though I will miss not being able to replace it with another one down the road. It just means I'll have to take extra-good care of it, because it's going to have to last me a long time (along with a Mustang GT and a Subaru BRZ). They might be the last ICE cars I'll be buying in my lifetime.
Enjoy the Stinger while we can. These are are autumn days of high-performance ICE cars in general. The time of soulless, anodyne, autonomous EV appliance boxes is coming. Cars like the Stinger are just plain
fun, having the car directly hard-wired into your central nervous system. I look forward to driving it, something that for me would never happen with an EV. Once cars like the Stinger are gone, it's very unlikely they'll be back. Get out and drive, enjoy it while you have it.