No, it should show it as tabs, because that's what it is. Ideally, it should show it as 8 column tabs, as that is what gofmt assumes by default.
But this isn't just a reaction rooted in practicality. To me, this looks and feels absurd. It kind of hurts to read. Again, this is just my personal take.
I prefer scope indentation of any kind to render as 4 spaces, but I'm okay with 2 as well.
Yes, it was just a personal opinion.
It was only used when you invoked the other option to use spaces instead of tabs. Both options are now removed. gofmt doesn't care how wide your tabstops are.