Maybe so. But if you're interested in it and not just pointing out how ridiculous it sounds, then my DD was more random than my son. She only occasionally has had periods of pooing to a schedule.
But it's called elimination communication because it goes two ways. It's not just you knowing when they are going to go and putting them on the potty. It's the baby recognising that an opportunity is coming up ( through consistent timing), or signalling they need it ( through body language when they are tiny, and afterwards through sign language or then verbal skills) and also reacting to your cues ( ie putting them on potty and making a noise/ saying a word/ singing a song).
It's just a combination of normal stuff, communicating with your baby to see what they need and teach them. Like feeding, that's usually done at regular intervals, at the response to the babies cues. Or giving solids, that's usually done at set points in the day and the baby is taught to expect feeding whilst sitting in a certain place at a certain time. Or like sleeping, most people agree that some level of sleep training is necessary for a healthy happy baby ( ie observing naps and having a bedtime routine or something similar) . And if course there are all different sorts of babies that eat dufferently and sleep differently. But the majority of people agree with a combination of listening to the babies cues for when they are hungry and tired and offering and teaching structure and expectations . Don't know why it's cinsidered so weird and outlandish to do the same with going to the loo.
:-)