Definitely improved, but I actually think it's still got too much expungement.
Let's examine why.
Termination of the resource is recommended if it shows signs of [DATA EXPUNGED]
It's usually a faux pas to expunge data from containment procedures. I've seen it done, but I don't recommend it. You can still keep it vague if you want - refer to another document or whatever, or use some kind of euphemistic language (my favorite option, but I can't think of a good example at the moment). Of course, if you refer elsewhere, make sure to put another expungement or reference in the Description or an addendum.
Sawdust subsequently shed from the object will gain [REDACTED] properties, dramatically increasing the risk of containment breach.
Why bother redacting this? It's sawdust, I can't think of any reason that it would be really horrifying. It seems like a placeholder until the author could think of something.
On the other hand,
Some of the features of the horse are worn down or not present, possibly due to natural phenomena or [DATA EXPUNGED]
…I'm fine with that expungement, because thinking of other reasons why the features might be missing or worn is sorta intriguing for me.
A couple other nitpicks:
although work continues in the lowest levels of Site-32.
That isn't clinical tone. Just say that research is ongoing or something and leave it at that. It sounds melodramatic to phrase it that way.
Doesn't make much sense for that to be an addendum, unless I'm missing something. Seems to me that it would go in the main Description.
The only way to get SCP-YYY to exit a rage state seems to involve placing
Couple issues there. "get" doesn't strike me as clinical. "seems to involve" implies that they're only SORTA sure that putting a kid on the horse will help anything. It's pretty clear that it does. So you could reword the sentence to read something like:
The only known method of causing SCP-YYY to exit a rage state is by placing
That's vaguely awkward (or maybe I just like second guessing myself) but you get the idea.
The SCP still feels overall unfinished. You might solve that by addressing the issues I listed, or there might be more work needing to be done, but I couldn't answer that question until those issues are addressed. =)