No. Just like signing up for a conventional account on any website, the only thing that an individual must prove to open a PDS account is that they are human (probably by solving a captcha).
Later, when using a PDS account to set up an online relationship with a service provider, it’s the service provider which determines what information the individual needs to disclose and to what degree such information needs to be trustworthy.
In some cases, the service provider – say a Further Education college offering or a family doctor – may request online proof of an individual’s legal identity not because such proof is necessary for the delivery of their services, but rather to help link the individual to any existing offline records that they may maintain. (Or they could make the linkage by face-to-face contact instead: a teacher can recognise a student, and just as a doctor can recognise one of their patients.).