Hello @MeesMusic. You might want to look at this link - "(bonus track)" and "Artist X cover" in ETI [STYLE-777]. For the most part it seems like the release link you provided pretty much is correct according to the style guidelines. Dosen’t really need to be entered as a separate release as the “grey” area (bonus track) is explained in the annotations.
Of course others might have a different idea for this particular release so let’s see what happens as others respond. By the way, you furnished everything needed in your question!!
Edit note: Opps, forgot to take the 2 different disc ids into account. I agree with the next 2 replies in this circumstance.