Hard to say for sure. They may have legitimately found something, but my experience with McAfee products has been abysmal. The last time I dealt with it, someone had the full paid version of their virus scanner which was up to date but wasn’t finding anything. I ran the free version of AVG and found over 200 items (mostly trojans and other malware). Their research may be valid, but I certainly wouldn’t trust any of their software to find even widely-known issues.