I don't think that would be possible, as Liberapay is essentially just a UI for accepting donations directly into the developers' Stripe/PayPal accounts.
https://helloastra.com/blog/article/average-software-develop...
The numbers in your source also contradict your statement, but point taken that European dev salaries are much nominally lower than American ones. It's still obviously not enough to pay a dev and business expert
EDIT: wow I just checked and the weekly amount they receive just went up to ~$875!