Yes, it is a joke.
Because people don’t read labels.
It will solve nothing.
For at least 25 years we’ve had to endure people very rapidly reading the fine print at the end of radio ads. Those warnings have probably been heard by every radio listener thousands of times by now.
If you had to wager, how many times would you guess that rapid-fire fine-print and disclaimer recitation has saved people from their own stupidity? What is the cost/benefit of these aural warnings?