What's wrong with the app label?
App New Version recognizes a Windows app as the latest version. The XML has as first entry an Only Windows Version which is taken as App New Version.

appNewVersion=$(curl -fs "https://info.lens.poly.com/lens-dt-rn/atom.xml" | grep "Version" | head -1 | cut -d "[" -f3 | sed 's/Version //g' | sed 's/]]></title>//g')

Installomator version
v10.6 Date 2024-11-29