Sanders might be calling himself something different, but he isn't doing a 180 when it comes to what he stands for. Trump was for massive tax increases on the rich, was for single-payer HC, was strongly pro-choice, donated millions to Democrats, the list goes on and on. The only reason he is running as a Rep and not a Dem is because he is an opportunist, not because he had some sort of ideological rebirth. Two years from now he'll be a Dem, then a Green, then a Communist, then maybe a Rep again...whatever he happens to feel like that day.
The sad part is how many Republicans the guy has hoodwinked when he is so obviously a fraud. Doesn't say much for those people, quity frankly.