I presume this version in the 'Files' tab is supposed to be for 1.19?

I suspected it was just a typo, but when I try to launch the game it says mod is only compatible with 1.16.2

https://www.curseforge.com/minecraft/mc-mods/mouse-tweaks/files/3828448

1.19+ means "1.19 and subsequent 1.19 versions"