You’re right. I “misspoke.” Here’s a link to a previous post I made on the subject a long time ago. See the text I included describing Figure 5.15 (the last figure at the bottom of the post). Use Closed Fitting in One Ear or Two? - #29 by jim_lewis
So, one path predominates over the other if, at some frequency(ies), it’s >= 10 dB louder.