yes i was watching live and my immediate reaction was goal (not knowing the law correctly!)
i think your conclusion is correct as only one person touched it (assuming fernandes was further than 4.5m away as i havent seen it back)
unless the west ham player wasnt ready though i'm not sure...
Don't think it needs anything official and doubt cfa will be interested, just drop the secretary/manager an email saying you've been made aware they all caught covid around the time of the game and it would be helpful if they'd told you. At least they'll learn for next time.