SCP Foundation

So i know that 343 has pretty much always seemed like a benign/benevolent sort of guy but he also seems to be directly destroying information about himself. Also theres the box test with the example of the cat which randomly replaces itself with another cat from anywhere in the world should be considered keter, while there is no way to contain 343 so why isnt this guy considered euclid if for no reason other than to keep security from getting to lax around him.

Then as far as writing advice when doing something like an interview how do you handle names? Dr [X], SCP-[n]?

Personally, I read it as 343 rigging the system because he wants to be safe-class.
Realistically, he is only contained voluntarily and could leave any time. And it's explicitly stated in the text that he influences staff mentally at least to the point where they wander in to chat all the time, despite the Foundation's best efforts.

So it's not a big jump to conclude that gee-oh-single-dee, is setting his own class level. Either with a straight up reality bend, or by influencing staff to make the decision he wants.

In my opinion, if you are going to be writing the names repeatedly it is best to give each party a short placeholder designation that are visually distinct from each other. SCPs should almost always be referred to by number, to keep clinical tone.

Example:
Interview of subject D-8675309 (Subject) conducted by Dr. Jaqueline Hyde (Dr. H) after test #17 of SCP-9898.

Dr. H: Please describe what you saw
Subject: It was crazy, [EXPLETIVE] crazy! Turkeys everywhere!
Dr. H: Please remain calm. Did you see where the turkeys came from?
Subject: Straight out of the faucet, a whole [EXPLETIVE]load of turkeys as soon as I turned the tap like you told me.
Dr. H: For the record, subject is referring to SCP-9898. Currently presenting as a lime-green bathroom sink.

Perhaps I am taking the wrong message from the article, but here's my take -

Do you notice how the first Doctor somehow vanished after wanted to question 343 and all his visitors? All his orders, documents and even staff's memories of him vanished. Also note how Dr. Beck's notes were said to have vanished as well, but there is one left where Beck says staff should be allowed to visit him?

So there are two options - like wishun said, SCP-343 could be altering the document to make himself look less dangerous. Or, he is manipulating staff to classify him as Safe - otherwise, you'll simply be removed from reality.

The real question is, if 343 is really God, why voluntary containment? For shits and giggles?

My take on his class is simply, in the olden days there's no lockbox test and object class is often mixing between containment reliability and how the object is. Since people in-universe think he's harmless, they classified him as Safe. By our current standard, he would be Keter.