Regulations prevent Carnival from offering an unmodified version of Cheers in Texas. So while it is not telling the whole truth, it is also not really a lie.
But as has been mentioned it's all academic. What matters is brass tacks - no matter the true reason, you're not getting Cheers until day 2. So with that fact in mind do you still want to buy Cheers, or even buy the Carnival cruise? I'm sure to some people not getting Cheers on day 1 is a deal-breaker for the whole cruise.