Everything you posted is missing some major components. No fuel injectors for example - the stock injectors aren't up to the task when you boost. I don't see the hot side piping so you will need that. All of the piping will need to be fabricated -so you have some cutting and welding and even what piping is included may not be what you need.
There is a reason a kit made for your car is more expensive than those. They have everything you need right in the box already to go. Most even come with a base tune, or at least a tune to get you to the dyno.
Also, I noticed this in the write up:
Heat powers the turbochargers turbine inlet. Keep the heat inside the exhaust pipes
Not exactly it isn't the heat that power the turbo, it is the exhaust (which yes, is hot and causes heat). But that is not a technically correct statement from the seller - because you don't want just heat because that will just cook the turbo and heat up your intake air.