Well, that has never been the case. The algorithm of the network is defined by the most widely used implementations, which so far has continued to be Bitcoin Core. Bitcoin Core is maintained by a group of humans, who use some form of decision making process (whether it be implicit or explicit). The more effective that decision making process is, the more reliable and durable the system will be.

Doesn't every open source project have governance in some form - be it implicit or explicit?

In the extreme case where code is written that never needs to be updated (which is hard given the changes needed for scalability and security, never mind additional functionality) - then maybe you might not need a governance structure.

The post highlights is that governance always exists - the question is how formal or informal it is, and what that means about the decision making process and its performance (e.g., speed of decisions, whether it reflects key stakeholders).

Humans still write the algorithms and deploy the binaries.