Do not redact containment procedures. From an in-universe point of view, somebody that's dealing with a containment breach,1 won't be able to properly deal with this thing, so a lot of people are going to die while it's out.
move he specimen
move the specimen
Dr. ███ should be alerted
Don't redact a specific person's name if they're important to containment. It means that someone would be trying to contain it, but doesn't have the clearance to do so.
It's also not a good idea to specifically refer to any single person, because if they're indisposed2 then they can't contain it. Instead, say "one level # personnel must be alerted."
SCP-XXXX should be consistently monitored by a security camera with identification software.
Generally speaking, this kind of stuff is taken for granted.
Site-██ would work better in this case.
Is written very conversationally. Try to stay away from sentences and phrases you could reasonably drop into a casual conversation you'd have with your friends about your article.
the entity morphs into another preexisting human (SCP-XXXX-2),
How did the foundation realize this? There's ~7 billion people on Earth, so the chances of the Foundation putting two and two together are slim at best. Remember, you as the author know the whole story, but the Foundation has to figure it out through observation and experimentation.
SCP-XXXX-# should always start with -1, just so that it's easier to remember.
organism's choice in seems entirely random
Selection of SCP-XXXX-2 instances is arbitrary in nature
location, social status.
"location, and social status."
During day ██ of it's captivity, SCP-XXXX morphed into O5-█.
██ days after containment, SCP-XXXX assumed the form of O5-█.
blown covers for the O5 Council.
Everyone that works for the Foundation knows what the O5s look like, so people can't easily pretend to be them.
In terms of personality, SCP-XXXX displays roughly the same personality as whichever person is taken, but with a tendency to be forgetful and/or depressed.
SCP-XXXX displays the personality consistent with the current SCP-XXXX-2 instance, displaying symptoms of short-term memory loss and depression.
There's more, but it's mostly just problems with your clinical tone.