Yes. Vitali was inactive for longer than 12 months when Wlad beat Povetkin and was consequently dropped from all rankings. Hence Povetkin became #2.
Lineal is simply a title for the academics to worry about. Hes the best HW in a world by an absolute mile, and if hes not lineal, then no one is.
Wlad is the universally recognized undisputed heavyweight champion. Until someone beats him, that's how he will be called.