It is surprisingly good!
Not clear if you can go without a manual step where you need to change the likes of SPEAKER_00 to Bob and SPEAKER_01 to Sarah, but I've not had it mess up on me at all transcribing 2 hour long conversations between 6 people.
You may have been reading a different version of the documentation. Documenter.jl outputs are dependent on the code actually running (and it's the package DifferentialEquations.jl uses to build its docs).