In strict terms, regarding the definition of an arrangement, I would agree with you.
But in this specific case, many songs were (in my opinion) not only rearranged, but written again.
I mean, they added up to 3 guitars to the original song, percussions, some piano instead of guitar, new guitar solos written, strings, background voices, to create a full unplugged work.
And it sounds like the band share that opinion, because they registered some new work, with some specific titles like “Born to Touch Your Feelings (Unplugged 2013)” instead of just “Born to Touch Your Feelings”, and additional composers, not just arrangers.
However, the booklet only says “arrangements by” witch does not pay real tribute to the work done… And this is why I’m so confused with that issue…
Anyway, I’ll go with the majority