No, it's supported in the drivers that run my GPUs for a lot of my games, just not actively updated to support new games. Horizons still works great, which is nice. I believe the last GPUs to support SLI are the 3090s and new games since 2021. My drivers are newer and still support SLI for existing games since then.SLI isn't supported by anyone anymore. Even the manufacturer of your GPU doesn't support it...
Also, SLI does seem to be implemented for Odyssey actually, but Odyssey is not configured to use it well, which is kind of weird. Probably just lumped under the same convention as Elite: Dangerous and Horizons, I suppose. See here for GPU and SLI, CPU, and memory loads for both Horizons and Odyssey on my computer if you're interested.
Anyway, I think it's reasonable to expect game expansions to support the hardware features that the base game makes use of, especially when making such a significant difference in performance, bearing in mind that I got Horizons and Odyssey with the 2015 LEP, not purchased separately later. But as I had said, it is more of a niche feature, so it's understandable though unfortunate for me that it isn't a priority for Frontier.
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