Did Hoid make the entries in arcanum unbounded?

[Koloss17 She/They]

So I was rereading the Mistborn Era 2 books and the end section on metallurgic arts aroused my interests. It seemed like the narrator from the arcanum unbounded novel. He describes things in a way like he’s from other parts of the cosmere and that he’s doing research of some sort. I’m assuming this is Hoid, right? I’m not making a theory, just seeking knowledge.

[Calderis he/him]

The author of the Essays, and the Ars Arcanum in all of the books, is named Khriss. 

She is the woman who asks Wax about his powers at the Ball in BoM, and she's also in WS... But that takes place before she's written any of those things. 

[Koloss17 She/They]

23 minutes ago, Calderis said:

The author of the Essays, and the Ars Arcanum in all of the books, is named Khriss. 

She is the woman who asks Wax about his powers at the Ball in BoM, and she's also in WS... But that takes place before she's written any of those things. 

Thanks! That makes things clearer

[Lunu’anaki he/him]

55 minutes ago, Koloss17 said:

Thanks! That makes things clearer

She's also in Mistborn: Secret History.

Spoiler

The woman who spoke with Kelsier on the lake

 

[Karger he/him]

Her manservant is named Nazh and he he makes appearances on her behalf in SA as well as several other places(he is fun to spot).  I believe both are now associated with silverlight and the 17th shard.