Just to be clear since I am not sure it was: I am not contesting the fact that GO bars are a "complete food": they offer a nutritional profile in terms of nutrients, vitamins and minerals that can be considered "complete" -- or at the very least its similar to current other foods stating they are "complete". Whether that definition of "complete" is right or not is another subject (since the "completeness" is based on DRV or PRI values from EFSA or other organisms, one could always challenge whether or not a "complete food" should "just" match or exceed them and in which situation).
In other words: the protein contents are "fine" if you think in terms of "minimum/recommended values for the average adult", thus GO bars do fit the definition of "complete". The new GO bars actually still beat that minimum recommended for protein (it's something like 60g a day for an adult of average weight) by a 50% margin, clocking in at around 95g of protein if you were to consume solely that.
However I personally think that it is still way too low for protein, because of the observed benefits of high-protein diets. Allow me to redirect to Queal's blog entry of the subject, which contains relevant factual information: https://queal.com/protein-why-high-queal/
Since my personal daily minimum is 150g, with a target of 200g, and the new GO bars offer halved protein per € value, they just have become way less interesting to me that the previous GO bars to fill up holes in my diet.