Interesting post about Maya 2022 (2023 and higher version) and Deformer Sets:
https://forums.autodesk.com/t5/maya-animation-and-rigging/maya-2022-and-deformer-sets/td-p/10599169
Basically they were replaced by Component Tags, which means copyDeformerWeights command cannot normally work to copy weights.
But apparently there is a workaround:
Deformer sets are still supported (and I'm guessing they'll never actually go away for compatibility reasons). You can switch back to them by disabling "Settings > Animation > Use component tags for deformation component subsets". You can turn it back on when it's convenient to migrate over, and existing scenes should work regardless of what that's set to.
Little hint for Autodesk Maya to edit keyframe node values using keyframe command :
mc.keyframe('r_tread_jt_02_path_uValue',e=True,index=(0,0), floatChange=0.05)
mc.keyframe('r_tread_jt_02_path_uValue',e=True,index=(1,1), floatChange=1.1)
mc.keyframe('r_tread_jt_02_path_uValue',e=True,index=(0,0), valueChange=0.1)
mc.keyframe('r_tread_jt_02_path_uValue',e=True,index=(1,1), valueChange=2.5)
