Will armor protection enchantments stack in minecraft

Background
Protection, Fire Protection, Blast Protection, and Projectile Protection are all mutually exclusive enchantments in survival Minecraft. I just need some clarification of some comments in the official wiki to understand what happens when these are mixed and matched in multiple pieces of armor.
Conflict
In the wiki it states under each of these 4 enchantments
If multiple pieces have the enchantment, only the highest level's reduction is used.
The way I read the wiki it sounds like it is a waste to have 2 of the same protection enchantments.
However multiple posts claim that protection stacks with multiple pieces of armor. Example from minecraft wiki. Example from Stack Exchange.
Is the wiki wrong? Are the blog posts just old and no longer true? Am I misunderstanding the statement in the wiki?
Question
As protection reduces damage by 4% per level which of these is true?
- Protection IV on 2 pieces of armor will reduce the incoming damage by 16%
- Protection IV on 2 pieces of armor will reduce the incoming damage by 32%
- Neither, please explain my error in understanding.
I am asking in the context of Bedrock edition (Windows 10, Pocket Edition, Xbox). Though would be interested in hearing how it differs in java if at all.
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Can you have multiple protection enchants on armor?
No. A piece of armour can only have one type of protection on it in vanilla Minecraft.Can you have multiple protection enchantments in Minecraft?
Protection, Blast Protection, Fire Protection, and Projectile Protection are mutually exclusive. However, if commands are used to have two or more of these enchantments on the same item, the effects stack.Can you combine different protection enchantments?
All protection enchantments are incompatible with each other. You cannot have Protection with Fire Protection on the same armor. That goes for every type of Protection enchantment in the game. You can place them on the same piece of armor with commands.What enchantments stack on armor?
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Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.