I really would like to call out the supplier who sold me that crap but I wont since its not allowed

ACRB 1kg has yielded around 4g of product with the cyb tek, defat and salting etc..
I tried everything but this bark does not contain more

ACRB sold as "root bark" was obviously not that, seems they sell bark from immature young trees for a low price as "root bark" with content of 0.4 or less.
it isnt that bad since I have enough for my experiments but in comparison to normal bark or mimosa this is bad quality. I will have to pay more and go to my usual supply

Dont take the cheap stuff you could regret it later.

Just to be fair just like any other plant there is going to be variations in alkaloid content dependent on the age of the material as well as when it was harvested, where it was grown, and countless other factors.

It is very possible you do indeed have genuine root bark and just have a batch with a low alkaloid content. Over the years there have been plenty of posts about poor yield on mimosa and other species as well.