Yes and no.
Because this is the March report (hence the title), we're trying to establish a baseline from an entire month's worth of data rather than just one weekend. This helps us avoid trying to hit a moving target while making these posts, and it provides historical value. I've mentioned this in some of the earlier reports—perhaps I should add a disclaimer section—but many of these numbers are different if you look at them today.
Ancient Text was in the $50's right up until the beginning of April when the price decline you mentioned started. Thus, when we do a follow-up to these meta baselines, they'll have more recent pricing data. It might seem weird to use older data, but consider what you can infer by knowing the price was in the $50's before crashing to the $20's-$30's: Ancient Texts doesn't have the same demand it used to.
I suspect that some of the new Mortal Judgment spells have devalued it by offering competitive alternatives.