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Here is the revised English reply with the last sentence changed as you requested:

Thanks for looking into this. I don't think this is intended behavior. Experienced spear users will almost always attack while looking straight ahead horizontally, so hitting at a bad angle is uncommon in practice. As a result, in most real fights the Netherite spear ends up dealing slightly less damage than it should. Also, at the optimal angle, all other tiers deal their expected damage—only Netherite does not. The fact that the maximum damage itself is wrong is strong evidence that this is not intentional. If this were intended, the advantage of Netherite over other spears would merely be a wider angle tolerance, not a higher maximum damage—unlike upgrades between other spear materials, which improve both angle tolerance and maximum damage.

Thanks for trying to reproduce this. Please note that during a spear charge, you need to keep your view level and look straight ahead horizontally to deal maximum damage. If you tilt your view even slightly downward, the charge angle becomes misaligned, which reduces your effective speed and lowers the damage. In your video, you were looking slightly downward, which caused the angle to be off. In my video, I kept my aim level and dealt maximum damage without any speed loss. You should be able to reproduce it by keeping your aim straight ahead as shown in my video.