This article addresses a number of very interesting and valid points, such as the possibility to move to better farming environment, or getting farms closer to consumer markets.
Having the ability to change location has several advantages. It allows finding areas where water quality is better as this varies with seasons and climate conditions. It also can allow farms to move away from the routes of wild fish and substantially reduce risks of disease and parasite contamination and spreading. Being closer to consumers market also has the advantage of reducing the amount of transportation and have the fish brought to market faster, therefore fresher, theoretically.
However, this article does not address a number of important aspects of fish farming. Going far offshore brings some organizational issues, such as rotating the crews working on farms, or dealing with rough weather. Probably some fine tuning would be needed to organize feed deliveries to such farms as well and the mobility must not happen at the expense of the life of equipment or the functioning of cameras and computers used for management purposes. As such, nothing that cannot be resolved, but it would come at a cost as well. Then it is to the farmers to weigh the pros and cons and make their decision.
Nonetheless, this is an interesting idea that shows that this industry is in full evolution and is adapting to the future.