What you are asking for is that he post you the results of research that has only just started.
Which means that none of the conclusions the OP jumped to, can be made. But they were too backed into their corner to admit that. Hence no reply when I asked for where BHF or the latest research made these claims about AF.
Like you’ve now posted above, they are starting to research to see if there is a link with ultra endurance cycling That does not mean there is a link. It may even prove the opposite, that it lowers the risk. Even if it does prove increased risk in that circumstance, it does not prove any link to the everyday cycling that many on here undertake each day. The title and video are click bait, and misleading.
Plus we need to remember the denominator in ultra cycling. Tens of thousands take part in ultra cycling length distances every year. How big will their sample size be and how will it be controlled for and selected. Many a paper has been shown to have selection bias, poor controls, or too small a sample size to be meaningful; due to a poor understanding of statistical methods as not all scientists have an excellence grasp of the subject. Plus when it comes to probabilities as in risk, that’s a whole different branch within mathematics, some overlap, but the subject goes much much deeper. I’m happy to go with the overwhelming scientific evidence, but it should always be viewed with a critical eye 👁️, and not expanded beyond the particular circumstances it (has yet to) examined.
The mathematicians meanwhile, are too busy building our AI overlords (My degree is maths by the way).