I'm not really sure what the issue is. Advertising of any kind is notorious for having to suspend disbelief.
Also, I don't know if he thinks that people will see the ad and then go buy a kayak and jump in the water without having done any research or gotten any guidance about kayaking. I'm pretty sure the first brochure or article you read about 'kayaking for beginners' is going to include the safety information that he thinks is lacking in the ad.
In short, it's an advertisement. It's not a how-to.
Also, I don't know if he thinks that people will see the ad and then go buy a kayak and jump in the water without having done any research or gotten any guidance about kayaking. I'm pretty sure the first brochure or article you read about 'kayaking for beginners' is going to include the safety information that he thinks is lacking in the ad.
In short, it's an advertisement. It's not a how-to.