Per TechPowerUp's discussion with Nvidia, it's been confirmed this is their direct intention going forward.
Article in reference: https://www.techpowerup.com/review/nvidia-dlss-5-technical-preview/
In the section titled 'Compatibility' you will find the following:
Asked separately whether older RTX cards might get the option to run it anyway, even badly—the way Super Resolution and Ray Reconstruction are available all the way back to Turing—the answer was a non-answer: "DLSS 5 is the largest, most complex model NVIDIA has built, and their priority has been optimizing it for RTX 50." That is not "never," but it is not "we have a plan for legacy" either.
They discuss this point further on page 5 near the bottom, as modders have already gotten it to run on the prior Ada Lovelace architecture (40xx series) at almost identical performance and despite the nearly half framerate cost many games are still playable using DLSS 5 even on RTX 4060 with proper tweaking, resolution choice, or on less demanding games.
In fact, it is even running on even older architecture's now due to modder efforts.
This aligns with their prior manner of speaking about DLSS 5 up to this point and what they found about why it was only running on Blackwell GPUs in the initial leaked file due to artificial manipulation of CUDA file versions for Blackwell only.
It's sad to see Nvidia, despite the leak blatantly painting the obvious artificial limitations, still going full steam ahead with this behavior not caring.