Are 1934 US 100000 dollar gold certificates still honored by the Government?

No. It's illegal for a private citizen to own a $100,000 gold certificate, even if they could find one on the market. These bills were printed for use within the Federal Reserve System but were never circulated to the general public. All but a few were later destroyed.

Since then there's been a lot of confusion because various companies make similar-looking novelty "bills" that sell in gift shops for a few bucks. In addition the market has been flooded with fakes, mostly printed in Asia.