As with anything, it is on someone who claims something exists to prove that, not someone doubting such existence. As in this case, you are claiming that there's a concrete connection between KM-SAM effector design and 9M96E that it could be called a variant, and I'm telling that's not true. Then it's not on me to prove that such connection doesn't exist.
I have never doubted this. I've also exclusively said that there's clear AA involvement in KM-SAM development. They provided basic technological basis for the SAM system, especially the radar. But KM-SAM is still an independent product. Korea for example developed its own X-band space-feeder PESA demonstrator prior to developing the KM-SAM radar, so it's also not the case that KM-SAM was entirely designed by AA, as some other forum members have claimed on this thread.
Most importantly, what I'm explicitly disputing is your claim that 'KM-SAM effector is the variant of 9M96', which, as I've said countless times, is outright wrong.
Although the SAM system was co-developed with Russia, the effector itself was developed by ADD and LIG Nex1, and input from Russia was limited on this front. The most notable Russian input was the cold-launch technique and the ACS side thruster technology, but as you could very easily notice, the ACS design is very different from that of 9M96 side thruster. They also differ in their warhead design, KM-SAM effector is guided by a Korean Ku-band seeker and the ACS and warhead position itself is also different compared to that of 9M96E. It also doesn't have cannards, indicating very different aerodynamics and handling characteristics. KM-SAM block-I terminal guidance solely relies on tail-fin and side ACS. The booster is also proportionately shorter on KM-SAM compared to 9M96E. When all these clear evidences can't convince you, LIG Nex1's own magazine Gndeun also mentions the same, that the SAM complex was developed with Almaz Antey but the missile was developed by ADD and them as their own design.
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There's already a precedent in Korean SAM design (K-31 Pegasus) where the SAM system was co-developed with a foreign company (Thales) but the effector missile was an indigenous design (Crotale and Pegasus missile designs are very noticably different similar to 9M96E and KM-SAM).
The writing is basically on the wall and it's so easy to notice them. It's important to understand that it doesn't really matter how many media outlets claim the same thing, when none of them have a concrete first-hand source to support what's written in the article. If anything, a lot of those "report" that you've cited just parrot what they've found elsewhere without much consideration, which is especially more true when it comes to South Korean weaponery, of which credible information in English is very obscure.