How is this low cost? J1772 chargers can easily be found for this cheap or cheaper. 16A chargers go for $120ish these days, and 32A capable ones are only... $140-150.
I don't know what you are referring too, maybe it's aliexpress level and they skimped on wire thickness. Most of the cost is the pure copper cable here, which should indeed cost 100+ for a 16ft cable, if you don't want it to melt when it's hot outside.
I don't know if they're skimping on the wire thickness, but frankly I doubt it. Tesla can offer their UMC for $250, and that's a branded product from a car manufacturer and is also capable of handling 32A charging all day.