Typically, these types of cold storage facilities are unitized wall, floor and ceiling panels (preformed foam filled) locked together by camlocks. Internal/external framework is provided to support the structure as necessary for wind and snow loads. Additional or combined structure is used to support the mass (product) internal load. All depends on the size of the facility.
Cold storage envelopes are mostly just that, and do not attempt to support the internal product loads.
It may be that, in this case, the product load exceeded the rating of the product supports, and upon failure a cascade of product precipitated into mass structural failure of the outer wall which could not contain the load.
Cold storage environment, an isolated area, minimal supervision, overloaded conditions..simply a bad connnection. You can speculate the cause. It is unfortunate that a life was lost.
pennpoint