Ok - you cant have a value to hit on a NLE meter that gives compliance to a loudness delivery value. The 2 are completely different things.
The loudness algorithm is designed to meter based on programm type , not just electrical energy - thats how it deals with percieved volume not just actual level.
re I have the Loudness radar set as a plugin on the Master Channel, however, nothing I do changes the final value.
If you have a loudness meter and its not showing any changes, then theres something wrong which i cant help with as i dont use a video edit tool to mix audio (just like I wouldnt use a knitting needle to dig a foundation! wrong tool.
Premiere might not support or bus the audio like it is needed to make a radar app work, but I cant help there.
You need to familiarise yourself with the delivery loudness spec of the territory you are delivering in - its more than just -24 lufs.
Id get a dub studio involved if youve a client who is hiring you to get it right, as I dont think you can in this PPro environment.