A bit of gray area for you. consider the application over the specmanship. Why are the stiffeners there in the first place? Is the rigidity requirement a high function i.e. very necessary due to potential shock and vibration , etc.?
The soldering is a process decision, any variety of fasteners could have been used. Consider what force the mechanical bond is designed for, then determine how much solder is really needed. The IPC spec is not just for an electrical connection, it is conjunctive for all the reasons solder is placed in a through hole. Consider that without a well formed miniscus of top solder, the possibility of dust, liquids, etc, can be entrapped (over time) in the below grade well around the pin and cause an oxidation or premature failure of the joint.
Consider what may happen if you pull test that joint. Will the stiffener break first before the solder? Will you pull the plated barrel out of the fab with minimum solder?
Be practical first, then apply specs to set a standard, if necessary.
By the way, if you are building this assembly for a customer, what do they want? Can clear up any unnecessary academic debates if you get their spin on the issue.
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