Vocal Removal is a dead simple tool. Anything appearing exactly identical in left and right is cancelled. Usually that’s the voice, but also can be bass and drums.
Stereo vocal effects are different in left and right. So they stay behind.
Vocal Removal fails way more often than people think.
I think the vocal reduction works fairly good for this song. The reverb stays at about -40 dB.
That’s enough to overdub the audio with the own voice–if that’s the goal.
See also the following topic for the same song with isolated vocals.