Nvidia have always claimed that the 3090 isn't a gaming card. They were calling the 3080 the "gaming flagship" back at Ampere's launch. I assume they declined to comment when asked why they then allowed partners to make custom models covered in gaming branding, if the 3090 really is a Titan-class card.
That's not true.
https://www.nvidia.com/en-gb/geforce/graphics-cards/30-series/rtx-3090/
GeForce RTX 3090
THE BFGPU
The GeForce RTX™ 3090 is a big ferocious GPU (BFGPU) with TITAN class performance. It’s powered by Ampere—NVIDIA’s 2nd gen RTX architecture—doubling down on ray tracing and AI performance with enhanced Ray Tracing (RT) Cores, Tensor Cores, and new streaming multiprocessors. Plus, it features a staggering 24 GB of G6X memory, all to deliver the ultimate gaming experience.
Starting At £1,399.00
8K HDR Gaming
Connect, play, capture, and watch in brilliant HDR at resolutions up to 8K with GeForce RTX 3090. HDMI 2.1 makes it possible for 8K resolution on a single cable. Capture up to 8K HDR footage with the GeForce Experience™ ShadowPlay™ feature and play back smoothly with AV1 decode.
Go to 34mins and 14secs he talks about the 3090 and clearly a gaming card too. Just Nvidia marketing with the 3080 and 3080 Ti because sounds silly to pay £1400 at the time for a 3090 to game on, but was sold as a gaming card too, the first 8K gaming card as he put it. Reality now is it's a £3k card to buy if you can't grab an FE.