That article has very little resemblance to a regular office space.. and its deceiving. Besides if you live in a cold climate are you just going to leave the door open?
I own/run a company that we clean HVAC systems in offices and you would not believe what we find in the air ducts... By now all of my guys swear to never work in an office! (especially on older buildings).
Anyway, a poorly maintained HVAC system can absolutely carry airborne particles that can include COVID-19 virus. Here's an article from the CDC if you have any doubts:
https://wwwnc.cdc.gov/eid/article/26/7/20-0764_article
My advise to all of you who work in a building: Ask the landlord to show you hard evidence the HVAC system (not just the motors or grills) have been cleaned by a company with a NADCA accreditation. If they can't or they won't then work from home, seriously.