Ah nope on that one - Estadio Azteca in Mexico City has over 110,000 seats - and while there is no roof as such, the awning does cover the whole seating area. Obviously as the sun moves across the sky some seats are in direct sublight - but technically they are all covered.
The new Wembley will be the largest fully enclosed stadium when the roof is closed - but there are at least 3 stadia in Latin America with higher seating capacity.
As for unobstructed views - hundreds of stadiums can claim this.
While it is an impressive stadium, the attached hyperbole is bullsh!t.
You may say this, but as far as I know the capacity of these stadiums would be much lower in a FIFA staged event.
The capacities you quote may be true, however, due to health and safety in an international event the capacities have to be drastically cut.