First thing: I just crossed that particular bridge, and what should I bump into but breakable vines.
Second thing: although I agree with you that this wiki isn’t up to a good standard, no one is paid to do this.
Also, there is an option for you to do it yourself, and I would be happy to see such work.

There are vines and a Dragonrider in front of this door.
There are vines, a priestess, and an archdrake pilgrim before the ogre guarding the Singer's Dress and Life Ring +2, in the cave a bit further on.
This site is correct.
You are a silly little shouty child who is having a tantrum due to their own inadequacies.

There's the door near the Demon of Song which only open if you're hollow. Then there's also Navalan where you can only start his quests if you talk to him while hollow.

The door near the Demon of Song is to recover human form in case you have no effigies?

Someone wasnt paying attention to the story.

The story in this game is just a lot of guesswork.

The story in all souls games is a lot of guesswork, that is deliberate and one of the reasons why people become interested in the lore, it is no different in this game so what is your point?

This isn't the only instance where a soul is not where you expect it to be, and I do not see how that can be considered to be an issue. Is the game too complicated for you, do you need someone to hold your hand and wipe away your tears?

No, not really. Maybe they wanted to remove an incentive to kill Vendrick? In my own humble opinion, killing Vendrick should give the player his crown and soul. The ring and clothes should be on the floor. Simple and logical.

Vendrik used the power he took from the giants to remove his soul from himself, because Neshandra wanted to corrupt it. And he put it in Amone because the singing ladys suppress creatures of the Dark.

no its easy to find since there's a whole huge dragon guy blocking u on the bridge

That's pretty clear. I really am not sure what more you would want from a description. It's kind of hard to describe the door if you don't know what you're looking for.

How could you play through this area and miss it, do you need a tour guide on a little choo choo train?

You have to go through 3 cycles to get certain spells also, e.g. Wrath of the Gods.

More like Wrath of the ***s.

A common theme in souls games, the difference with DS2 is that ng+ adds more to the game, making it more worthwhile to do.