This pic pretty well sums up my experience with the Blunt rim and a tubeless Neo. It did this with two different style Stan's rim strips and a ghetto strip. The problem isn't the ghetto system, rim strip, or no strip. The problem is for truly reliable tubeless mode with a Neo and Blunt, the fit between tire and rim is just too loose. I had the same issue with a Stan's ZTR355 rim.
On the other hand, some have had no issue with running this setup tubeless. The ghetto setup lasted on mine better than anything I tried, but in all cases where I had a blowoff like the one pictured, I was in an aggressive, technical turn at speed, and just peeled the tire off. I know how to deal with tubeless setups. I've been running tires in tubeless mode since Stan first came out with the idea of using latex mold builder and packing tape. I never had a tubeless issue like this until doing the 650B NeoMoto and a couple of different 650B rims. Neither the Neo nor the Blunt are designed as tubeless items, but neither were many/most of the 26'er setups I ran without issue. As some others, you many have no issue with the Blunt/Neo. Just be aware that it is a possibility. Both the tire and rim are outstanding items on their own IMO...or if you run a tube. I finally found a Sun CR18 rim that fits the Neo like a glove and have ridden it extensively in tubeless setup.