I believe that they did it for the swing states, certainly - but by numerous different methods, as the Navarro report seems to indicate [disclaimer - haven't read the Navarro report, which I'll have to get on doing. Thanks for the Filthadelphia tidbit - didn't know that.]
I've been comparing 2016/2018/2020 county vote turnouts [2018 turnout for US Senate, which of course is not there for at least two-thirds of the states].
I also consider Virginia and North Carolina to be swing states that they pulled shite in.
They got away with Virginia, but the NC Democrat candidate's d*ck-out cost them that steal.