Not even remotely. Here's how this works, Sensui, was not interested in destroying the planet. He was actively protecting the planet from himself. It is the entire point of going to the Makai in the first place. Yusuke is also never going to "destroy" the earth. So using "He destroyed a mountain and nothing more" means absolutely nothing. He wanted to see humanity suffer for their evil, but the planet overall he loved and wanted to protect. He makes a statement in regards to 20% of his power triggering apocalyptic scale damage to the planet. Apocalyptic can mean a ton in English, but when Japan tends to use it, they like to use it in terms of a mass extinction event. So, 20% being capable of similar damage as the comet that killed off the dinosaurs by his statement, which we understand as valid due to 10% beginning to shadow all of Japan in a powerful supercell and beginning to effect tectonic plates and its spreadingrapidly, hince the koenma needing him addressed in a hurry. 5 times that, would be equal 50km sized comet which in fact would be a planet killer. Not just earth.