This is true in a world of balanced power between Congress, the judiciary, and the executive.

It is not true anymore, as all power is centralized in the parties. The House’s impeachment power will essentially never be used against the dominant party’s President, which allows POTUS to act with impunity and strongly incentivizes him to secure his party’s House dominance — a dynamic we’re seeing very explicitly at play over the last few months.

POTUS keeps the House reps in power, the House reps let POTUS do whatever he wants. Both win by severing their need to have popular policies in order to hold political power, so that’s what they work to do. Gerrymandering is an absolutely critical tool in this effort which is why POTUS has been publicly pressuring “members of different parts of the government” to pursue it (and they are!)

So no, it’s not a non-sequitur.