If the OP follows the directions, he'll be back on his bike in 2 weeks. That doesn't seem very onerous. He can still exercise (and he should) just not get too sweaty for a couple of weeks. If the advice is ill-informed, it will cause him little harm.
If he had a life threatening cancer, I'd be inclined to point him in the direction of the latest research. But with this situation, I can't see the down side in a conservative approach.
Still, the OP can read the the article, check the papers it relies on and decide for himself. Or he could go for a brisk walk, stop for coffee and cake and tick off one more day that he is doing more activity than the average UK citizen, if a little less than he'd like to.