The module page says:
This module is officially supported by Mollie. Finlet is the official partner of Mollie for integrations with Drupal.
But this Module / Drupal is not listed on the mollie.com website integrations list:
https://www.mollie.com/de/integrations
For potential customers, Drupal and this module it would be very helpful to get the module listed over there? :)
Perhaps you can even receive a sponsoring for further development / bugfixes?
Closed: won't fix
2.2
Miscellaneous
Not all content is available!
It's likely this issue predates Contrib.social: some issue and comment data are missing.
The project description currently says
Mollie will drop support for Drupal integration by the end of 2023 and they will thus stop funding further development for this module.
So it looks like removing it from their website was probably intentional.