Key legal question
Whether the cantonal court violated federal law by refusing to hear the appeal as time-barred.
Extracted holding
No. The appeal deadline under cantonal law was 20 days, the appellant had received a correct remedy notice, and his mistake about a 30-day period did not excuse the late filing.
Extracted reasoning
Federal review was limited to violations of rights under Art. 95 BGG. The appellant did not show any constitutional or other federal-law violation. Because the remedy instruction matched § 9 EGAR and the appeal was admittedly filed after the deadline, the cantonal court could reject the excuse of an alleged error about the time limit.