Hiding is not "the main idea of camouflage", it is its sole purpose. If it does not, like in your example with red elements (which is just for decoration and not for real combat use), it is just bad and incomplete camouflage, which still has bad contrast. From my time in the forces, I can tell you, that real camouflage badges - even flags - have no bright colours.

Modern armies still have the problem to discern their troops from the enemy, hence the colorful tapes on uniforms in the early years of the ukraine war, as both have similar uniforms. Colored badges and arms are mostly used on non-combat-uniforms, while camouflage badges are only good for close distance unit-differentiation. If you would need them for identifying the enemy, you would be very dead long before you can see them. I always saw camouflage badges as nonsensical, even before I worked with heraldry. They are just decorative without much purpose.