The article you linked does clearly states it is not likely to happen unless a user "Jailbreaks" their phone and downloads from a source other than the Apple application site. The last 3 sections of the article makes this very clear.
This type of question has been asked and answered many times on this forum and many others. The answer is almost always exactly the same, NO. Feel free to ask all you want, just wanted to set the record clear.
I Have been researching on this specific topic from the last few weeks and found this article some helpful! Can iPhone get a virus
But I still have some confusion that how can an iPhone get a virus because they have one of the most secure systems in the world! Or there are no viruses created for iPhones? What's the reason behind it?