Whether the appeal filed against a draft decision is admissible
No. A draft decision under Art. 57a LAI is not a decision subject to judicial appeal; the appeal was filed prematurely.
Only decisions and opposition decisions can be appealed under Art. 56 al. 1 LPGA. The challenged July 24, 2015 document was merely a pre-decision notice, not an appealable decision. The later formal decision of September 30, 2015 could not cure the prematurity of the appeal.