Hey, I'm sorry for taking so long to calculate the feat, I was a bit busy, anyway, the calculation is here in my Sandbox, what name do you want me to put it to the blog? "Bokuhi's Attack Potency" is fine?
Okay, here is the blog, if the Demon King survived that attack I guess it also scales to his durability, and if Bokuhi can harm the Demon King with his normal attacks, his striking strength and durable scales too.
Bokuhi defeated the Demon King in the first chapter, and the Demon King should've been near Bokuhi when the rock fell due to the fact that the 20 meter tall dude isn't merciful, so he probably took care of the Demon King after taking care of Bokuhi.
On Carolina's POV, when she woke up and after talkinga a little bit, she saw a flash of light which is likely the meteor, and some talking later, Bokuhi arrived near her after he regained consciousness and put on his wig