While Brown includes as the last line, “And this shall be your language in those days,” that comment reads better as Samuel’s marker setting the poetic lament off from the rest of the text. It is not part of the lament proper.
Reading these passages as poetry helps explain the repetition of the “slippery earth” theme, which is redundant in prose but emphatic in poetry. Similarly, the immediacy of the loss of tools is poetic hyperbole, though, as noted above, it may be explained by widespread theft.