40 years running the largest hand surgery service in the UK, one of the top 5 in Europe and the benefit of seeing the influence of the psychology on physical symptoms. I was being conservative with my 50%! I routinely lecture and teach on the influence of confirmation and ascertainment bias in the medical field, the benefits of exercise in health, etc.
As it happened I did have longer symptoms and knew that I lost a lot of fitness but I still rode a solo 200km and then a couple of 100kms as I was in the middle of Europe when I got it!
That makes it a lot worse, as some people might even think that a hand surgeon's endorsement means it is a good idea.
The way you feel one morning is not necessarily the way you will feel 6 hours and 150 km later, far from home and possibly having to rely on public transport to get back and in doing so endangering other people.
It is an utterly stupid idea to ride that far whilst ill. There are far better ways to stay healthy and do exercise during a bout of Covid.
Also, in most of continental Europe, you still have to self isolate if positive. I hope you didn't break the law!