In the post, I specifically said Scheme had lexical block scoping. So, even if JavaScript had full lexical scoping (which it does not, thanks to with() and the global object), it still wouldn't have block scope (thanks to hoisting, though addressed in ES6), which I think is a defining feature of Scheme's approach to scope.
You're right about with(), which I'd forgotten about — JS with with() is not lexically scoped!
Access to the global object is still statically decidable. It just might raise an exception. This is not really different from Scheme.
I agree that block scope is a defining feature of Scheme's (and ALGOL's, and C's) approach to scope. However, Scheme's block scopes are all functions, at least if you accept the macro-definition of let that's been there since R5RS, rather than treating let as a separate primitive construct.
