It might be true, you never know. The OU probably isn't more 'recognised', but if degrees are degrees, then an OU degree is just as acceptable as any other degree. Point of importance being, some employers do appreciate the skills that are honed while studying independently, through distance learning. Whether or not an OU first, obtained while working and studying full-time (it's possible, I am doing it now), is better than a first from a 'top 10' campus university, will have to remain an unknown. Provided you can show you have the level of aptitude necessary to obtain a good degree classification, the rest is not as important - generally speaking.
Bearing in mind, the OU was founded at the same time as the plate glass universities, i.e. Exeter, Sussex, York. It is probably most comparable to said institutions, rather than the 'top' universities.