I'm not sure what the link said as it wasn't about coronavirus vs flu when I clicked.
The studies I've seen say that it has some variance between cases. The main symptoms at the outset seem to be a dry cough, a fever (which might not be very high in everyone). Tiredness and muscle aches, like with flu. And like flu, the precise symptoms and how you feel can vary as the illness goes from beginning, middle, to recovered. At some point it's said there could be some diahhroea and vomiting. And if there's a runny nose or upper respiratory tract symptoms they might come on later rather than at the beginning.
I got that from watching the Dr John Campbell vids and some case studies and journal articles that he went through in his videos a few weeks ago.