If you think that commercial is not Apple saying “we’re safe from viruses” then you’re either not watching it closely, or you’re so much of a fanboy that you don’t see anything Apple does with objectivity. In the commercial, the “Mac” guy claims “I’ll be fine” when told that there is a nasty virus going around. That is before the PC guy points out that there are thousands of PC viruses. The clear implication is that Apple is saying “Mac users don’t have to worry about viruses.”
IMO, you're making a mountain out of a molehill.
Many years ago, when that series of Mac-PC ads was produced, the simple true fact was that Macs faced negligible threats from any kind of virus. There were a few Trojans that relied on USER stupidity, and a few laboratory-only "proof-of-concept" bits of prototype malware, but no viruses loose in the wild that could do anything. So at that time, Mac users didn't have any significant chance of catching a virus. This generated a lot of smugness among Apple customers, and as they say, pride goeth before a fall.
Now a point of clarification. Trojans which attack the USER are different from viruses which attack the operating system. You could have the most well-protected military-grade system with all manner of security in place, but if the USER with administrative privileges decides to click on a phishing link and then enter their administrator password, there's nothing the system can do to prevent that. So we're not talking about Trojan-type attacks that depend on the user doing something stupid. We're talking about "viruses", which attack the operating system. Right?
Okay, back when the ads came out, there wasn't any significant threat to Macs from viruses. So the ads, while somewhat ingenuous and cutesy, were not incorrect. The ads have not aired (except as archived on YouTube, etc.) in many years. They were done in 2006-2008 as I recall.
These days, five years later, there are some real viruses out there that can infect Macs. It's still a tiny number compared to the Windows viruses, but there are a few, so the phrases "negligible" and "no significant threat" no longer apply to Macs.
In any case, all systems are vulnerable at some level, and all systems depend on the user not doing stupid stuff. Mac users who claim their systems are impervious to infection are foolish (and factually incorrect).
Please also note that no so-called "anti-virus" software gives complete protection either. The total number of active "in-the-wild" Mac-specific viruses today is still LESS than the number of viruses which SLIP THROUGH even the best anti-virus packages for Windows. That's because there are so many Windows viruses, which are being updated daily by the virus makers, that it's just impossible for the anti-virus folks to keep current. They're always playing catch-up, by definition. It's a tough business.
So don't bother being smug about the fact that Macs finally have a few viruses floating around. It's just as bad as the smugness that Apple users carried for so many years. Neither is appropriate to the reality.