VirusTotal isn't, though the numbers have reduced to one considering it suspect still 'Quttera', note Avast doesn't do the on-demand scan of a website in the VT checks it only checks live checks at user level.
So far you haven't indicated what the format of the exception is, which is why I posted the image as a hint, it needs the /* at the end of the url
For example hXXps://lootup.me/* and hXXp://lootup.me/* (note the XX is only there to replace tt so the link isn't active. the http one I put there as if there was mixed content http and https you need both exclusions.
Avast has no control over the sites content or the external links (436) of the site. If this meant effectively excluding the site from scanning it could be putting users at risk without them having knowledge of the exception or other method, means they could be at risk.
As an Avast user I'm not prepared to go down that path on a live system.