[eternalban]

No, that is not a program emitting to output stream "hello, world!"

It emits "{Hello, world!}" which is like emitting "func main() { print("hello, world!" } }"

A hello, world for this language would take "hello, world" as an operand to some operator that spits out strings. That example is not there.

[xiphias2]

If you read the description the language outputs programs. If it would be able to output any string, it wouldn't be concanative language anymore.