Ah! That seems slightly different from the format the person you're replying to described, but I have seen this version in use at one job.

There was only used by one person who gave no context on why he used that format, so it's probably no coincidence in such an example that to me the extra structure seemed to add only opacity and no real value.

I can absolutely imagine that being different in a company that used this convention widely and built tooling around it. Doubly so when a lot of the staff is junior enough that it's helpful guidance for structuring thoughts around what the commit does.