It's BS.
First, of course it's not the center of the Universe. The idea of the Earth even being the center of our solar system was debunked hundreds of years ago.
Next, you can't have an echo back that is louder than the original source. Where would the additional energy come from? The sound wave that bounces back from anything, no matter how solid, is lower due to energy absorbed into everything in touches, including air, and the rest is lost to it being dispersed.
Legends are silly.
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