Surely it cannot be an error.
Usual Rolex marketing guff which is hard to make sense of, but an error unlikely.
Their press release of the Deepsea challenge had some of these phrases and their 'testing' page has the phrases:
'Defying the elements' and 'Few companies have been so consistently identified with the pursuit of excellence, the quest for the absolute, the discovery of original approaches and innovative solutions. Rolex watches have proved themselves from the start in the most extreme conditions imaginable - from the depths of the deepest oceans to the summits of the highest mountains, in the air and on the race track. And to ensure that all Rolex watches can live up to these high expectations, every single one is tested to extremes before it is allowed to leave the Rolex site.'
So somehow I am sure they feel it makes sense. However, if they do go on to correct it after all, wouldn't that be funny!