Thus he (Odin) established by law that all dead men should be burned, and their belongings laid with them upon the pile, and the ashes be cast into the sea or buried in the earth.
not the same thing by a long shot. Such things are never decorated nor have any sort of monuments affixed to them.
As I said, cremations are standard pagan rites except for the far east and Judaic/Egyptian mummification. The 'burial mounds' are not places where the remains of individuals are preserved and monuments constructed to memorialize them as we, the and the Egyptians before us did. The difference being that the Egyptians and their Judaic and Christian successors preserved remains in the belief of resurrection. In fact, the entire concept of 'heaven' is completely pagan. There is absolutely nothing Christian about heaven. Pagans believe that spirits existed in another world and another form and arrive there upon death. Christianity and it's predecessors believe in resurrection in this world or existence. "Heaven' is an adopted pagan belief from the annexation of pagan lands by Constantine and the catholic church. Just as every christian holiday is an annexation of pagan holidays into the mnemonic Egyptian astrological record.
So yes, as it says, ashes and bones are sometimes placed into the earth and you can call this burial because technically that is what burial is. As for erecting graves and mausoleums to memorialize, house and preserve the remains of individuals, this is not a pagan practice. The dead are remembered for their deeds and and the stories told after them.
Well what is this that I can't see
With ice cold hands takin' hold of me
Well I am death, none can excel
-Ralph Stanley,
O Death!