The rubric says that each radial entry gets a value according to the location of the interrupting letter, so a scorecard would have 20 values of which 17 have such a location, even though there are 16 locations. So the two entries that share a location should each get a value and I do not think they share the value.
As a matter of fact, I could make an argument justifying a solution where there are only three occurrences in the centre, with a shared occurrence from two co-linear entries, and two separate occurrences in the cell in ring 6. There would still be 16 locations. Clearly not what is intended but why would it be wrong?