That doesn't seem like what they were proposing. From what I saw the idea was to flatten the curve at the point it is steepest, instead of trying to flatten it while it's still pretty flat, which just increases the time you need to keep countermeasures in place (because delaying only helps a little: it's very unlikely you can delay until a vaccine is developed, the main benefit of a few months delay is the NHS has less of its regular winter workload to deal with, which is higher than in summer).