Quite simply, this double-dipping is a good thing. When somebody is getting their Canadian Forces superannuation, part of it is the lifetime benefit and part of it is the bridge benefit they will collect until age 65 no matter what. Most people take CPP at age 65. For those people, at age 65 the bridge benefit drops off and CPP kicks in.
People can take CPP early, at age 60, at a reduced level; it's reduced by 0.5% per month before age 65. From 60 to 65, they're still collecting the bridge benefit, because the plans are totally separate. The bridge benefit still only disappears at age 65, but they're also collecting their reduced CPP from age 60 to 65. So they're collecting the double benefit. That's fine. That's a good thing.
At age 65, when the bridge benefit disappears, which is not related to CPP at all, that reduced level of CPP is going to stay there, and yes, they will see a reduction, because they have made the choice to take a 30% reduction in their CPP. At age 65, the bridge benefit still goes and the CPP remains forever, but at that reduced level.
Those people will undoubtedly see a reduction in total pension amount at age 65. That's the decision they made. They get five years of extra benefits, or double-dipping, but at 65 that comes to an end. They need to figure out how long that benefit lasts. For some people, it might be seven years and for some it might be 10, or whatever; it depends on their circumstances. But there's a crossover point sometime after 65 where the benefits of that double-dipping wear off.