A Keynesian thinks the government can create/shit money in whatever way including by......... selling stuff.
That's not true they believe if more money is introduced into the economy it will lead to an increase in employment and output. It is the supply side economists who believe if you generate output it will create its own demand. This is the point, if the products are made and sold internationally it will generate an income for the government. You seem to be making false claims about the economic schools of thought. This is definitely supply side economics not Keynesian at all.