I thought number 9 (e-0.9) was for android pie 
e-0.9-p-2020072865179-dev-chiron.zip
When I saw the new one e-0.10-p-2020080666687-dev-chiron.zip, I thought to myself, unbelievable! 
I installed it, no, it’s always pie 
Regain your privacy! Adopt /e/ the unGoogled mobile OS and online services
emphasized text
Let’s wait for the e-0.12 to clear any doubt then 
The number is only a number. Had nothing to do with version. The Android version is shown with the letter.
Thanks for your reply
(I will test e-0.12, just in case 
)
as @harvey186 mentioned the e-x.x is just a build code version and not the android version number. I agree this is causing some confusion to the users. Unfortunately this is also the versioning number standard in software code…we are also looking at ways to make it easier for users to decipher this /e/ version number . If there are any changes in the method will update on the forum.