Was bedeutet At 6 x 54, this cigar is the perfect length to enjoy after a nice meal and provides just enough smoke time to get yourself ready for dessert, that is if the cigar is not your treat in it of itself. ?

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As a whole, the sentence basically means: "If this cigar isn't enough of a treat by itself, it is the perfect length to have between your meal and dessert."

I'll start with the phrase "in it of itself." It looks like it is just a much less common version of the phrase "in and of itself." At first I thought it was a typo, but after doing some research it seems like it might be a regional variant of the phrase. Honestly, I've never seen anyone write it like that before.

"In and of itself" means "by itself" or "without anything else."

For example:
"Studying can be rewarding in and of itself." = "Studying can be rewarding, even without any additional benefit."
"Talent does not, in and of itself, guarantee success" = "Talent does not, by itself, guarantee success"
"You don't need to get anything fancy. Just showing up is enough, in and of itself." = "You don't need to get anything fancy. Just showing up is enough, without doing anything else"

In this case, "that" is referring to the idea that the cigar "provides just enough smoke time to get yourself ready for dessert."

"[A]. That is, if [B]" means "If [B], then [A]".

For example:
"Could you take out the trash? That is, if you get home before I do" = "If you get home before I do, then could you take out the trash?"