I found the entire Rebirth issue to be weirdly off, with "old" Superman appearing almost like a threat. I've re-read it several times and am convinced it was supposed to be readable two ways, constantly circling the idea that New 52 Superman can return as though this Superman is ensuring he can't.
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To this day I believe that Superman's smile at the end is supposed to be sinister as hell.
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I've always felt there was a fake/evil Superman story here (mirroring the classic Death/Rebirth) that was just never told.
Honestly, at this stage I'd suggest bad art/staging but this is Doug Mahnke and the guy is a master.