YepI don’t think they stopped any rigging in 2016. I think trump won by a landslide and they were not adequately prepared to prevent his win. They forgot their polls were garbage designed to form opinions and started to believe them.
2020 same situation, except they were prepared to digitally manipulate votes on top of mail in voting and the normal tricks. Again trump far exceeded their expectations with his massive campaign push which is why any person who cares to look at the election results can see something isn’t right.