Drilling the timber accurately for those pins is easier said than done. Notice they don't show how that is done. Any little variation, especially on bigger timber, would be a problem.
There is also very little relish behind the pins.
Lastly, I wouldn't use these on any outdoor structure or anywhere condensation could form on the metal and lead to rot in the timber. This is the argument against using metal gussets for repairs in old barns.
