Agreed, it is very unlikely this would work in the Fixlet Debugger. Let’s break this apart.
( unique values of (it as string as trimmed string) of values “InstallLocation” of keys of keys “HKLM\Software\Microsoft\Windows\CurrentVersion\Uninstall” of (native registry))
This returns every “InstallLocation” value as a trimmer string. Multiple results, one for each “Uninstall” key.
Preceding text of first “Remotely Anyconnect” of
From each of those InstallLocation values, this pulls the substring before “Remotely Anyconnect”.
This relevance could only work if there is only one InstallLocation value under all of those registry keys, and that one value contains “Remotely Anyconnect”.
In short, your query for registry keys needs a whose() filter to limit to only those containing “Remotely Anyconnect”.
preceding text of first "Remotely Anyconnect" of( unique values of (it as string as trimmed string) of values "InstallLocation" whose (it as string contains "Remotely Anyconnect") of keys of keys “HKLM\Software\Microsoft\Windows\CurrentVersion\Uninstall” of (native registry))
(This could still have an issue of there are more than one “Remotely Anyconnect” registry values)