It's heavily implied

And yet Hulk could fling him around like a rag doll no sweat??

*can press 30 tons* *never presses anything anywhere near 30 tons in any marvel movie, probably ever*

He's a frost giant for goodness sake. And he can shape change. And yes Hulk could still throw him through the Sun. I'm pretty sure he uses the shape changing thing to get chicks and piss off his adopted brother.