It is following the instructions it was given. That’s the point. It’s being told “promote this drug”, and so it’s promoting it, exactly as it was instructed to. It followed the instructions that it was given.
Why are you think that the correct behaviour for the AI must be for it to be “truthful”? If it was being truthful then that would be an example of it failing to follow its instructions in this case.
Not the article, the commenter before you points at a deeper issue.
It doesn’t matter how if your prompt tells it not to lie is it isn’t actually capable of following that instruction.
It is following the instructions it was given. That’s the point. It’s being told “promote this drug”, and so it’s promoting it, exactly as it was instructed to. It followed the instructions that it was given.
Why are you think that the correct behaviour for the AI must be for it to be “truthful”? If it was being truthful then that would be an example of it failing to follow its instructions in this case.