You're assuming that this site is run by Equifax; it is not. It is run by a "Settlement Administrator", a third-party entrusted by the court to handle the money

You're assuming that this site is run by Equifax; it is not. It is run by a "Settlement Administrator", a third-party entrusted by the court to handle the money and record-keeping associated with a class-action settlement. This is to avoid possible manipulation of the settlement by the defendant.