Many of the GPUs on that list still have hardware capable of encoding even more video streams simultaneously, but Nvidia still imposes a software limit on those GPUs to encourage people who encode lots of streams at once to buy its workstation-grade Quadro and RTX-branded GPUs instead.
The kinds of video you can encode will still come down to what your GPU's hardware encoder actually supports that Nvidia support document lists supported codecs, color depths, and other specs for each GPU. Models as old as the GeForce 750 Ti are on the list, as are most GeForce 900, 1000, 2000, 3000, and 4000-series cards. Most GeForce GPUs going back to the 2014-era Maxwell architecture now support the extra simultaneous streams, so you don't need a new or powerful video card to benefit from the change (though there are some models, particularly MX-series GPUs for budget laptops, that still don't have any video encoding capabilities, presumably because they're missing the hardware). Further Reading HandBrake video transcoder adds official AV1 codec support in latest release
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