I don't interpret rayiner's comments as supporting the independent state legislature (ISL) theory. ISL claims that the constitutional power of state legislatures to regulate federal elections cannot be limited by state constitutional provisions or rulings of state courts. I don't see rayiner as making that claim here – he claims that when state law provides for popular election of presidential electors, the state legislature can repeal or suspend that law, even in-between the popular election and the formal nomination of the presidential electors. ISL would go further, and say that if the state legislature chose to do that, the state courts could not strike it down as a violation of the state constitution; I haven't seen rayiner make that claim anywhere in this conversation; but, if he doesn't make that further claim, what he is espousing is not the same thing as ISL.