The rests in these measures (see arrows) seem to be unnecessary? Whenever there is a quarter rest for this "voice", there is a quarter note in the "main" voice of LH. And whenever there is an 8th rest, there is a corresponding 8th note in the "main" voice. In other words, that "extra silent voice" always perfectly overlapped in exactly same time with the other voice (not partially) (see yellow rectangles). So it's just as if the two bass voices could practically be combined into one?
Also, just to confirm: these measures are mainly LH playing, correct? Asking because I saw some used right hands for those groups of bass notes.
(This is Henle Verlag urtext https://i.sstatic.net/vvbdP.jpg)