I'm no partisan Republican, but I don't think that's true. Creating seats until you gain control also undermines electoral process, and the "For the People Act" pushed DC statehood. That's a naked grab for two more safe Democratic Senate seats, especially when any concerns about the enfranchisement of DC residents could be solved with less of a partisan power-play (like letting Maryland annex most of DC).
If you read liberal-leaning comment sections (e.g. like the NYT's), there's a lot more extreme fantasizing about creating new liberal states and abolishing or politically neutering conservative ones.
I definitely think the Republicans have been "trying to undermine the electoral process itself" more blatantly, but the Democrats aren't saints either.
And frankly, if the Republican threat to democracy is so dire, probably the best thing to save it is for the Democrats to shoot their progressive wing in the head and loudly run to the center, become competitive in conservative states, and focusing on routing the Republican party above other ideological goals.