Believing in some far-fetched (or indeed any) explanation without having any proof is dangerous. It is dangerous in the case of the flat-earthers and it is dangerous for project leaders and team members.
Whenever a theory emerges why something works (or doesn’t) in your project/company, it is your duty to either prove it right or wrong.
Oh, and by the way: yes, it is indeed true that there are still people who believe the earth is flat!