It turns out it was indeed a confusion and the remaining funds are about 15,000€ which makes for a decent income to compensate @fr33domlover since he resumed his participation around June 2022 and until October 2022.
This is a great example of how flexible and sensible NLnet can be. And will be an inspiration for people who found themselves in similar situations. It is always worth checking if unspent funds are available instead of assuming they are not.