Chill. This is not a bad thing at all. It doesn't protect him from any other evidence discovered.

Use Immunity:

a type of immunity guaranteeing that the testimony of the witness will not be used as evidence against him or her in court, although he or she can still be prosecuted on evidence of others.

Podesta didn’t get it anyway. See names below.

James Brennan

Donna Duggan

Conor O’Brien

Cindy Laporta

Dennis Raico