Manipulation of voters works best in low turnout elections. The more people vote, the harder it is to manipulate either the voters or the voting results.
That's a fair point. In a two party system, you drive turnout where you know you can benefit, pass enough broadly popular legislation to have a plausible bid for reelection, then ignore your constituents and do what your party and donors want.
None of this seems specific to a two-party system. You’re just caricaturing the democratic system in general, without offering constructive criticism or any alternative. You also haven’t addressed the point made by the comment you’re responding to.