Taking a wild guess here , but i assume they have not release those as those are probably still subject to change and highly volatile.
Imagine they show what each champ tech does about 5 months ago and during dev test they decide to adjust it , they would basically have to post every few hours changes and it would simply end up in a stream of info that would make little to no sense and most people would probably not even bother reading it and would only read the last update where it says "hey this is the final form" (which will most likely pop around the last few weeks of dev time).
So i think they simply skipped writing a blog every few hours with adjustments to champ tech of +1% or -3.2% because bugs , balance or other reasons and will most likely post the final version when they are at a more stable state.
I am not part of the devs nor do i have any access to anything specific , this is just my own personal wild guess.