If there is no drywall on the ceiling, it qualifies as new work regardless of the advertised box type. The main reason cables get stapled in new work is to keep drywall screws (or the now-less-commonly-seen drywall nail) from penetrating the wiring. It's not really a concern in old work where the drywall is already in place – hence why the cable can be fished behind drywall in old work applications without being secured/supported.
The linked product advertises "NEW CONSTRUCTION READY: with Globe Electric 90141 Mounting Plate (ASIN B00C6WHN6E)", and you will need to use this for your new work installation of these fixtures. You will need to secure and support the NM cable every 4.5 ft and within 12" of the junction box attached to the recessed lighting fixture per section 334.30 of the NEC.
Per Ed Beal's comment: Where the wire runs through a hole in a joist or other framing member, this contact with the framing member counts as supporting. Otherwise, some form of cable staple, cable strap, or other listed hanger/fitting will be required to secure and support the cable.
Relevant excerpt from 2014 NEC, section 334.30
Securing and Supporting. Nonmetallic-sheathed cable shall be supported and secured by staples, cable ties, straps, hangers, or
similar fittings designed and installed so as not to damage the cable,
at intervals not exceeding 1.4 m (4 1⁄2 ft) and within 300 mm (12 in.)
of every outlet box, junction box, cabinet, or fitting. Flat cables
shall not be stapled on edge.