Yes except I misspoke, it's not "1 session" it's "1 adventuring day." But looking at the info again, it's less than thatYikes!
Do you have a source for these "designer comments"? One session per level sounds very strange to me. I mean, a short, focused and limited campaign could be fun as a kind of "one shot", but I prefer long campaigns that could go on "forever" and where neither the GM nor the players really know what will happen (quite the opposite of an "adventure path", in other words). This requires level advancement to be slower than "normal", which may not be to everyone's taste.

Interesting analysis thread where I found about said XP curve led me to
Older thread where it's talked about and the designer intent is talked about led me to
Designer comment - Mearls replying to why the 5e XP curve is so "wonky" after 10 as compared to previous editions.
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