The whole relevant paragraph reads thus:
A key part of great product development is to stay close to customers, listen, and take a thoughtful, data-driven, and research-oriented approach to building products. In our case, it is critical that we work closely with our community to listen, change, and evolve rapidly. As an example, over the past several months, we had a lot of dialog with our community about how best to enforce and evolve our code of conduct. We learned that we needed much better channels to listen to our moderators and community members. We have not evolved the existing channels of engagement for power users in our community, like Meta, or articulated how we intended to make improvements going forward. This has caused friction as our user base and business have rapidly grown. We acknowledge these issues, apologize for our mistakes, and have plans for improving in the future.
I put some emphasis on the issue. Basically the CEO acknowledges part of what users have been complaining about, acknowledges that the company didn't do enough on that, and is now apologizing for that specifically.
Notice that if you read the whole text around it, the CEO mentions this as an example of what he noticed could be improved. So probably he meant to apologize for everything else the community has been complaining about as well.