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Rule 2.4 states that a project should have no unused tag declarations. However in Rule 5.7, a tag name shall be a unique identifier, there is an exception that allows the tag to be the same as the typedef name. You give this example:
typedef struct coord
{
uint16_t x;
uint16_t y;
} coord; /* Compliant by exception */

Can this also be an exception to 2.4 ?

The phrase "struct coord" is redundant if it is not used anywhere else in the code. The code could be rewritten as
The exception in rule 5.7 assumes that "struct coord" has been used some-where else in the code.