I've spoken to a Qualcomm engineer about this article. He responded by telling me, in fact, he was one of the engineers that dealt with the issues that highlighted after it was published. He asserted all of those remote-execution holes were addressed, and the article has been a constant pain since because it was never updated to reflect that.
I'm not a close friend of his, but I've met him on multiple occasions and felt confident he was telling the truth.
I've worked with Qualcomm chips before and I guarantee you that it was only due to the public response that they fixed those holes. Qualcomm has an institutional problem that makes it nearly impossible for them to make secure silicon and any fixes they apply now are just damage control.
I'm not a close friend of his, but I've met him on multiple occasions and felt confident he was telling the truth.