It would be nice if players with old hardware(OpenGL 2.0 hardware) can also play, if there is a version of this mod worked for 1.16.5 then players like me could play as well!

As explained in our FAQ, no official backports are planned. However, since this is open source software, anyone is free to make one themselves. Please see https://sinytra.org/docs/connector/faq for more information.