https://precisionrifleblog.com/2015/06/24/muzzle-brakes-field-test/
https://precisionrifleblog.com/2015/08/21/muzzle-brake-summary-of-field-test-results/
https://precisionrifleblog.com/2015/08/07/muzzle-brakes-sound-test/
I found these articles to be extremely useful in determining the effectiveness of any brake design that I've looked at. They didn't test all of the brakes mentioned in this thread but they tested a good variety of styles that should translate well to any brake you find and any brake mentioned in this thread.
That definitely looks like a pretty effective brake but I don't see how it doesn't direct percussion back to the shooter. The more effective a brake is, the more it directs the gasses to the rear.
Two similarly designed muzzle brakes that were tested, the APA Gen 2 Fat bastard and the Alamo Four star, can be found in the articles provided above. You can see that those types of muzzle brakes increase the sound level by over 8x that of a bare rifle and are louder than any other brakes. This tells me that these styles of brakes direct the most percussion backwards out of any brake design.
If you wanted a style of brake that does not direct percussion backwards, you will have to trade-off recoil reduction and go with a style that has 90 degree ports like wind gyspy mentioned.