What age are we actually potty training our kids?

It seems everywhere online if you see a video of a baby walking there's comments about how they shouldn't be in diapers. Even if the video has nothing to do with that. I often wonder if these people have kids because most walkers aren't talking yet. Aside from EC (and kudos if you managed that but it wasn't right for our family) how are they supposed to say they gotta go?