Very good point @agauger. If you notice, I never wrote “10X more similar,” which is not true. I only wrote “10x more different”. There is a difference, and the difference is consequential. 98% similar is 2% different and 80% similar is 20% different. 2% is one tenth of 20%. Human/chimps are about 10x less different than mice/rats.
I also point out that I have simplified and rounded numbers here to aid understanding. You, @Agauger, will have a more detailed understanding of this that I also share. Do not interpret the rounding of numbers as a lack of precision in my understanding.