It implies that an exclusion wasn't present before, which is true. The EULA previously did not include a claim on content, but people were misreading it that way. So, as a point of clarification, they changed it to explicitly exclude a claim on content.

I see how you are reading "excludes a claim on content" as meaning a claim on content was removed. But what it actually means is that an exclusion of a claim on content was added.