As far as I’m aware it is on-demand (if installed) but it is in the Smart Scan if you run that.
However, I’m not so sure that this is the WiFi scan, possibly it is the Firewall, it may be the firewall is on Public Mode. If this connection is Private (only his company network) then this check might not be done. I can’t say this with any degree of certainty as I don’t have the Avast Premium Security and its Firewall feature.