It only goes up to that because he wasn't the general nominee.
So first you asked for proof. I gave said proof and now you ignore said proof because it doesn't fit your narrative?
It's not proof of anything other than the fact that Hillary treated Bernie with kid gloves during the primary, and that you may not fully understand the dynamics of campaigning.
Trump had to face his campaign against Hillary by selling himself to the American people and proving that he was better than her, despite the fact that she was more qualified than he was. If Trump was against Bernie, he'd have to maneuver his campaign in such a way as to tear down Bernie's support, which would've been much easier than proving Trump's own likability.
This poll indicates that if the campaigns continued
as they were at that exact moment in time, Bernie would have won. But that's not how campaigns operate. That's not how Hillary's primary campaign operated, and it's not how Trump's general campaign strategy worked. Trump's attacks against Bernie would've been devastating, and a lot of the Democratic base would've stayed home. A chunk of Bernie's own supporters would've turned on him and likely gone over to Stein. A large portion of minority voting blocs would've stayed home.
It would've been the same amount of people being disenfranchised, but just different people for different reasons.
Not to mention, conservative media would've had a field day in whipping up their base into an even bigger frenzy, since the word "socialist" is still so, so, so dirty in right-wing circles in the country. One photo of Bernie's schmoozing in Cuba (not to mention his honeymoon location) would've sent the GOP into a whirlwind of hysteria. There would've been a much more pressing, panicked, urgent
need to keep him out of the White House. "I'm sick of the Clintons" isn't as volatile as "THIS IS A COMMUNIST TAKEOVER OF RED-BLOODED AMERICAN VALUES!!"
And this is also to say nothing of the fact that Bernie had a sincere problem getting people to show up to the polls to begin with. He was the master of caucuses, but lost the vast, vast majority of states where you actually had to go and vote.
I really don't feel like re-litigating the primary again, because there's a fascist dictator in the White House, but y'all Bernie people need to let this "Bernie would've won" shit go. There's no actual real evidence for that. Let's focus on the main target for now, yeah?