Although the results are valid, the value of this test is precisely zero.
Playing on pc differs from playing on a console - you can have 50 opened tabs in your web browser, play music through Spotify, Tidal etc., Discord app running, maybe downloading something to use later. F.e., if I die in a multiplayer match I may jump to Windows and browse the internet and move between multiple apps. How will it impact the smoothness of the system will all the things running simultaneously? Nobody knows.
The above stated is exactly the reason why somebody would consider 5800x or 5900x over 5600x "for gaming". Because who just turns on the pc, starts up the game, and does nothing else? And not because we know that 8-core CPU will help, but it will mitigate the potential problems tremendously.
Two problems with your statement.
One, open apps may or may not have any affect on a game. For instance having 20 tabs in a browser open will have a TINY affect if some of the tabs are actively updating the page, but the work on the CPU is TINY. It does on the other hand load up memory. I could go on with the other apps you pointed out and it's the same. They ONLY have an effect if they are actually doing work. Otherwise they're taking up space in memory for the most part. That could end up being a problem.
Point two. WHO DOES THAT????
When I'm playing a game, I'm not listening to some tunes or blah blah blah. I have everything I don't need shut down. I don't stream, so a 6 core CPU is fine. But, I build for a few years and different game companies have said they're working on improving CPU usage for higher core CPUs, so I got a 5800X. But, there's other work I do where a 5800X is better than the 5600X. I could get more benefit from the 5900X, but this is work that's a few hours per month, and it's not worth spending any more money than what I paid for the 5800X.