It does.
This is a conservative court and they tend to go less with individual rights. I'll have to think more on this one but my gut reaction is that it closes an overused loophole that guilty parties (or rather their lawyers) use to quash prosecution. How much trouble is it for someone to say, "I invoke my right to remain silent"? They don't seem to have a problem invoking their right to legal counsel.
My understanding is that once they invoke the right to counsel, questioning had to stop. I think this may abrogate that. I'll ask an attorney friend.