Hello, I'm a big fan of Kamen Rider and Super Sentai and there are a lot of SFX and Entrance and Transformation Sound Effects. I have seen a lot of Japanese channels publish SFX sound of the characters separate from the music of the episodes of the series. I ask myself how they can do this? I know about voice separation and instrumental separation. However, nowadays we can separate the drums, guitar, piano, and any musical instruments with AI.

But the SFX in Kamen Rider have Music+SFX+ and sometimes voice actors.

The Japanese are so skilled at voice separation in Tokusatsu series, but how do they do that? The audio looks clear and clean. So I know some people use 5.1 sound and search for SFX in the multiple tracks on Blu-ray. But Blu-ray is only for special movies when the audio is in 5.1.

The series are in 2.1 audio. But what I didn't understand is how they extract such clear sound and perfectly isolate the sound of a series in 2.1.

The sound is not field whoosh on loud doom sound in background
Can you recommend how I should extract my own SFX from the series? The Japanese seem to break the rules of the universe, separating sounds into multiple sounds, like "unbaking a cake."