This article is borderline malicious in how it skirts the facts.
This wasn't a case where KeePass was compromised in any way, as far as I can tell. This appears to be a basic case of a threat actor distributing a trojanized version via malicious ads. If users made sure they are getting the correct version, they were never in danger. That's not to say that a supply chain attack couldn't affect KeePass, but this article doesn't say that it has.