The led is cheap but unproven, no Radiant Intensity figure so no way of telling how bright it is. The divergence angle is good for using a reflector but finding a reflector to suit it perfectly is not easy to say the least.
The Oslon is cheaper (not so when mounted on a star admittedly) with known Radiant Intensity and a divergence angle suitable for use with an aspheric lens that are cheap and easy to find.
The heatsink has a hole exactly where the led is mounted, exactly what you don't want when trying to keep the led cool.
The driver needs to be manually set up, who has a multimeter and knows how to use it properly?
Seems like he's just picked a load of parts that seem to be what you need without trying it.
Whether he's trying to lead people up the garden path, trying to show that really he's a good guy or trying to get some credibility who knows?
