This speech if directed to the human who is arrogant with his money, wealth and authority. Does this ungrateful and denier human not know that there is a time when graves are scattered with their dead bodies and the shrouds and the disintegrated bones, on judgement Day when the earth trembles?!

بُعْثِرَ (scattered): The power of Allah (swt) gathers humans after the scattering of the graves.  

Meaning, does not this stingy person know what will happen when people are resurrected from their graves and are presented in front of their Lord?

The significant point in this verse is that Allah (swt) uses the word (are scattered) instead of the word (are resurrected), this is to give additional meaning; as if Allah (swt) is telling them: Do not think that these graves will keep as it is, closed on those buried inside them and will never be opened nor broken, rather, they will crack and everything inside them will be scattered, and then are gathered by the power of Allah (swt).