I’m not sure I fully understand the scepticism.
The ratios are very easy to calculate yourself. In the responses to the original proposal the two registered FinTech apps Ugly Cash and Sentz both submitted the addresses where they hold eUSD. If you sum up the amounts there and put them in relation to the total amount you get the ratios in the proposal.
Here are the current ratios as a screenshot from a Google Sheet, e.g.
