Neither of those make my statement any less true.
There’s a lot more to attack Hillary on. Sure, the “socialist” card would be thrown around, but the only people that would be convinced by that nonsense are the people that enthusiastically voted for Trump. But there’s a large amount of people that voted for Trump on economic policies alone, and it’s pretty likely that the majority of people in that category would’ve swung to Bernie.
Of course this is all speculation since we don’t live in the timeline where he got the nomination, but it’s not wild speculation, it’s all very grounded in reality and it’s based on things that we know or can reasonably assume.