Well ,
I have checked a few stakes again, there is now way we get the 200% ROI as advertised it more like 100% ROI per year.
Here is my calculation sheet, also below that my staked value on the 16669.16122186 amount.

Staked value

This is not good if advertisement is wrong, but if it is they need to fix it stat,
, I think all the POS are not value-preserving.