Yeah I've used this
I thought they meant a site that would do the transcribing for them

Rather than personally having to speak the whole thing into text

Which I think you could do with this
although I had problems with it just doing half a sentence and then getting confused 

 This is neat and I didn’t know it existed, but my specific use case here is for a bunch of pre-existing audio files, not live dictation 

 I eventually found an AI site that would do it and it did a good job
But it did require like 10 USD and an email address