Where have you seen conservatives trying to resurrect labor unions or overturn Citizens United? So far, I've only ever seen such suggestions coming from the fringe left (e.g., Bernie, AOC, etc.) and always shouted down as "socialism".
Both obviously need to happen regardless, but I don't see either happening in my lifetime short of a (probably bloody) restructuring of US government, and even then, only if we're lucky.
I think their point is that wanting things that we had in the past isn't the sole domain of conservatives.