S3D doesn't support gyroid as an infill option. Thanks for posting that video, it was interesting, but I don't think the conclusion was gyroid is the best infill. "Strength" is extremely design and function dependent, and there's a lot of other variables that were not commented on that can determine the "strength" of a component. That video proved that if you print a cube, with the same settings as he did, and that part will undergo compression, then gyroid is a good option.