I mean, technically braces ARE part of Python syntax. They're used by sets and dictionaries.
But I know what you meant, and yeah...they'll never use braces as block delimiters. IMO, that's a good thing. Whitespace-as-syntax means you're FORCED to have a minimal level of decent code formatting or it doesn't work.
Also, just to make sure I understand the joke. It's basically just saying that they'll never add braces to the python syntax, right?