A few notes here:

First of all according to taginfo “bicycle=not specified” isn’t used often if not at all so a different tag would be preferable. From my understanding of how this was tagged it seams to me that “bicycle=not specified” would have the same meaning as “bicycle=customers” since when there isn’t a sign specifying that a certain mode of transportation has different access on a section of road or sidewalk it is implied that it is the default and since this is a (I assume) only for customers (since its in a cemetery) it would be “bicycle=customers”. As a small note since “bicycle=customers” would be the default on the way “bicycle=customers” probably shouldn’t be added since it would be implied. 

Second off all, on secondary roads going into highways (in this case HEFT) bicycle=no is implied so shouldn’t be added. 