A few days later, he said he became deathly sick. Fever, coughing, and said he felt like he was going to die. His wife became very sick shortly after his illness began, and his 8 year old son as well. His symptoms did not completely clear up for him for a month. His wife was seeing one specialist after another for months with after-effects. His son got through it in 3 days.
All of this was before the first cases was officially reported by the CDC as diagnosed in Seattle on January 20th.
My friend's doctors did not know what they were dealing with at the time and did not test for COVID. After COVID became known, he looked into anti body tests. They were expensive ($700+ at that time) and he did not have one.
So this basically boils down to who to trust, your friend's uncle who works at Nintendo, or a highly regarded evolutionary biologist.
The mask issue was a debacle from a scientific communications point of view. In the early days, there was legitimate debate among scientists regarding the value of masks. But I think the main thing that went wrong was a paternalistic attitude, trying to address supply chain issues of N95 mask usage by medical and other frontline workers by convincing people that masks weren't effective. That, I think most agree, was a huge mistake.
Of course, your actual statement that highly regarded virologists tweeting that masks were "stupid" and "couldn't be effective" is false, and you probably know that.