Looking at their commenting history, they have a habit of italicising really often, so it's not specific to this topic. It does indeed make a lot of their comments annoying to read without obviously adding any value.
I’m going to assume that you mean that the italics don’t add value, and not their comments as a whole. I think your comment could be read either way. Anyways, even so others have since pointed out reasons why the might be used to doing so.