As I said before:
I didn’t say at all that I provided a link to scientific journal RSS feeds – quite to the contrary.
Most probably they don’t want to provide RSS feeds any more (the standards they are referring to in the XML are actually ages old and have long since been superseeded) but forget to remove them from the website.
Be that as it may, DT will probably not go out of their way to work with broken RSS feeds. Since OUP says that they’re offering journal updates via twitter, maybe that’s a way for you?