Nothing probably is/was wrong with the previous cans, but since this product haven't been produced in three years I could see needing or wanting to recheck certain processes. My thing is if the quality of the cans and/or ingredients needed to be re verified or adjusted why wait to the very last minute. A lot of this stuff should have been checked weeks if not months ago. Adrian has been in this position for a year and he just now realized adjustments may need to be made after three years.
Like I said in other messages, I have FOUR perfectly good unopened cans of DNA energy drinks right here which I purchased in 2014.
Someone else here mentioned that once upon a time, the cans were leaking prematurely... presumably because the contents corroded through the aluminum. So, Adrian may be a bit paranoid about a possible recurrence.
The four cans I have are still just fine. I have no way to know if the aluminum has interacted with the contents on the inside in any manner. However, the cans are still solid on the outside.