Q: Can a vocal remover actually strip 100% of the lyrics completely from any professionally mixed song?
A: Honestly? No.
Let's be completely transparent here. A fully mixed mp3 is like a baked cake. You can't just forcefully reach in and extract the eggs without ruining the cake. You can isolate frequencies, but you will almost always hear a faint, metallic, watery echo of the original vocals bleeding through.
Q: How does it work then?
A: In the old days, it was simple phase cancellation. The software would take the left speaker channel, flip the phase perfectly upside down, and sum it with the right channel. Anything sitting perfectly in the center (which is usually the lead vocal and the kick drum) would mathematically delete itself by colliding with its own inverse mirror image. Nowadays, tools use intense artificial intelligence algorithms trained specifically on thousands of isolated a cappella tracks to recognize and remove human voices.