We often promote multiple items on sale in a single email. I'm not claiming we didn't make a mistake in promoting these items together, I'm just pointing out that it was an honest mistake and not an attempt at deception.
Like I say in my final paragraph:
The Library is a relatively new offering and I guess we still have some lessons to learn about how we should and shouldn't market it because of its unique qualities. We will learn from these mistakes and correct them as early as possible.