Seasoning dual sizzlers came right off

I received the dual sizzler today and used it right away. The seasoning came off completely, and I read online that the seasoning starts to crumble at 343°C (750°F) and burns completely at 427°C (850°F). Since the oven heats to about 450°C (870°F), I'm wondering what this sizzler is good for.

Am I missing something?