To be fair, they're scraping the bottom of the barrel with "it's not iconic enough". We're down to completely subjective intangible characteristics now.
When you consider it's going to be 52-62k, will accommodate safe standing, will be not only within the city boundary, but part of the waterfront and near the city centre, will be purpose-built for football and not a converted athletics stadium, will be 4-sided, with steep stands tight to the pitch and a huge singe-tier home end, will become the premier venue for high-profile events in the city and will be the envy of football clubs all over Europe, there's not a whole lot else we can fume about.