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With the very strong caveat that neither am I, thw writer is not legally qualified. He seems most expert in quantifying the similarity of software code.
He is probably correct about the extent of copyright protection in the code, but even then he's being more definitive than the information he has would really merit, because there can be copyright in the overall structural organisation of software, as well as line by line code. As such, there can be infringing software structure in one language, where the copyright is in software written in another.
He's also completely silent on the possibility of copyright in the graphical interface, which is treated like an artistic work.
I did though read another one of his articles on this which made no sense, because he is confused between colloquial and differing legal meanings of the term "design" in different jurisdictions.
So its one of those things where there will be threads of accuracy running through an article that overall isn't.
A bit like me commenting on almost anything else.
