1)
Which Resha'im are discussed?
1.
Malbim: This includes those who always do evil, both Bein Adam la'Makom and Bein Adam l'Chavero. It is the opposite of Temimim, who are constantly virtuous. The Resha'im will be cut off forever, the opposite of Temimim, who will remain in the land forever.
2)
Why does it add "u'Vogedim Yisechu Mimenah"?
1.
Malbim: They are traitors Bein Adam l'Chavero. Even though they will not be cut off forever, they will be temporarily uprooted from it, unlike the Yesharim.