I hope you do realize that it's an old article.
That's the problem. Because it has been known for some time, exploits exist.
I am software developer but I do not understand enough of cryptography to understand whether the article is relevant.
I just saw that our coin was attacked a few days ago. Someone has generated transactions with 1,000,000 fee.
You have to ask yourself how this is possible and if there are other gaps in the core.