Linked in this Article documents (and from several other sites) how the 30 and 20 series GPUs were able to run DLSS 3 (allowing for performance gains DLSS 3 brings) however what are the chances Nvidia will try maintain DLSS 3 (if they do) on the 20 and 30 series cards (and will there be any difference between the Desktop AND Laptop cards getting it)?
Considering how both series of cards aren't overly old and still capable of playing the majority of titles around I personally think for Nvidia to withdraw DLSS 3 from the 20/30series cards wouldn't show a good picture for them as it already has been recognised that those cards can support DLSS 3 so aside from having more Drivers to Maintain/Support for more cards it would likely be seen as a good move from Nvidia, even if it did happen by a mistake/bug, to continue DLSS 3 Support thanks to the performance it would bring to those considering getting a new card for, more performance, more support for the card, etc...
Considering how both series of cards aren't overly old and still capable of playing the majority of titles around I personally think for Nvidia to withdraw DLSS 3 from the 20/30series cards wouldn't show a good picture for them as it already has been recognised that those cards can support DLSS 3 so aside from having more Drivers to Maintain/Support for more cards it would likely be seen as a good move from Nvidia, even if it did happen by a mistake/bug, to continue DLSS 3 Support thanks to the performance it would bring to those considering getting a new card for, more performance, more support for the card, etc...