Nah, due to DRM, I'm almost certain its not an accepted "workaround".
I just ran Loki for about 10 minutes and couldn't get Safari's RAM usage above 1GB but I remembered the issue I had prior was with Wandavision so I played a later episode of Wandavision. It looks like there's some kind of...RAM lock/leak. Something between the Disney+ module and Safari isn't releasing unneeded RAM. The issue is better now, but there's still a creep up. Before I got tired of streaming the video, I was able to get the RAM usage of Disney+ to 1.6GB and it was..slowly, but surely..creeping up.
It seems dynamic websites and Safari have an issue and I don't know what exactly is causing it. It isn't as bad as it was a few months ago, but its still definitely present.
How do people time shift then? Maybe they don't?
You might give Microsoft Edge a try. I had a problem two years ago where iCloud Notes would start out at 800 MB and creep up to 13 GB of RAM in about a day. Obvious memory leak. Same bug in Safari, Chrome, Opera and Brave. It was fixed in Microsoft Edge before the others. So maybe Microsoft Edge does a better job on memory leaks.