Surely you can see the point of view the enclosure is not really suited to Sea lions?
What's wrong with it? Its always seemed to be perfectly adequate to me. Not outstanding and maybe not that modern now but its okay.
The more I think about it, the less I think it lends itself to being 'converted' for Giant Otters. I think the water/land ratio is totally wrong. As others have suggested, a purpose-built Giant Otter enclosure in the South American area would have made better sense to me too.