The title and content of the post state that, if the UI is terrible, then it was (probably) created by a programmer. They do not say the converse, nor does the

The title and content of the post state that, if the UI is terrible, then it was (probably) created by a programmer. They do not say the converse, nor does the converse automatically follow (the converse being: if the UI was created by a programmer, then it is terrible).