I think the message is that if you have plenty of spare time to ride a bike or will do you good. However it doesn't help a fair few people without that much free time to do the significant mileage such as parents with young families or single parents, or carers, etc. I would really like them to do research into the average person and specifically how they can get the benefits efficiently and within the day to day function of their life. With childcare and family commitments I'm not even cycle commuting more than twice a week. We try to have active weekends but that's not been easy with family additions recently (dog not baby). I forsee this changing in a year or less (got an active breed of dog, border terrier, so fully expect to take up running and possibly cycling with it at unearthly hours of the day and night, to try and tire it out).
Anyway, news of this type of research tends to be about reminding people that exercise is good for you. If there's anyone left in Britain who does not know that please put your hand in the air. No hands! What's the point in these reminders? Personally they only make those who already do the exercise feel superior I reckon. I doubt it changes, that much, people's behaviour.