The whole effort is rather meager(albeit over priced), but interesting. I would opt for an adequately strong, weight bearing buckle, and tubular webbing rather than the flat stuff they feature.
Braiding lighter cordage around a strong core is an interesting concept and should be a straight forward DIY project. If I were to do this, I would use more than one type of light cordage. I was also amused by the fish hooks without any line. They make it clear that they are not using paracord, but whether their cordage can furnish lighter line for fishing is unclear.....
An ideal "survival belt" would be fully weight bearing, and would incorporate enough survival goodies to make a difference. Maybe you could even squeeze in FOUR matches, but then I have always been a hopeless dreamer
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Geezer in Chief