[310.15(A)]. No, because the cover makes that splice accessible.
[310.15(G)]. No, because of how that splice must be made. However,
it's still a good practice to use a box where practical. If not practical (for
example, the splice is under a residential lawn), it's a good practice identify
that splice by a physical marker. Where that's not practical (for example, the
splice is under a golf course), note it on the drawings or in some other way
make a record of it. Though the NEC does not require these markers or records,
they do aid in maintenance and repair.
[310.15(J)]. No, because the luminaire also serves as a box.
[310.16]. A separately bushed hole.
[310.17]. The heat that can be dissipated, and the ready
installation (or withdrawal) of conductors.