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It does make sense, I actually made a topic about this;
https://www.lfgss.com/conversations/248406/
Long story short; while top tube become longer due to the slacker seat tube, the distance from bottom bracket to headtube remain the same.
I think you're right and iirc the Pearson had an oddball seat tube angle which made the tt physically long but virtually short....of that makes sense. I never did manage to dial it in.