All that site does is mirror
Copart.com which is where those cars are sold. Some of them are able to be purchased by an individual. Some require a Dealer's License and some can be purchased through a broker.
To bid or find a broker you need to register with Copart.
Here is one of the Porsche's listed on the site the OP linked to. And it's real listing on Copart.
https://erepairables.com/salvage-cars-auction/porsche/911/vid-53659286
https://www.copart.com/lot/52485472/clean-title-1990-porsche-911-carrera-2-wi-milwaukee-north
Beware of going through third party sites as they will charge you more in unnecessary fees. Register with Copart if you have interest in a certain car.