That's a little off to say that. Their are instances when a product like that is helpful, it probably would not be the smartest idea to use these products from the get go. Yes fishless cycling is the way to go and yes it's safer for the fish, no one can rightly say otherwise.
But their are instances where a product like this is helpful. I've had power outages where all beneficial bacteria was lost. The power was out for a full 12 hours and the media ran dry. I wasn't home at the time or I would've figured out a way to keep the media stable. The ammonia reducer can be very helpful at times when things come up... We aren't all perfect fish keepers and we should always keep the well being of the fish first and foremost.