Your reference is rather misleading. The technique is a form of forcing and the plants cannot be grown long term inside without light. You start off with outdoor grown, healthy, robust plants. Then you move the roots inside where they push out new stem growth in the spring. Commercially this is done in large sheds but home gardeners do it outdoors just by covering the rhubarb plant in the spring with an upturned bucket or similar. After harvesting outdoor forced plants must be rested for at least a year before forcing again. Indoor forced plants are completely exhausted and are composted.

It is the same principle as growing any other blanched vegetable like chicory chicons, celery or cardoons. Exclude light and force new pale, tender growth. forcing rhubarb

Thanks very much. This is what I needed to know.