Propecia and degradation at high temperature

I see someone tried asking this over at ************ but no answers. It's about this abstract from pubmed. https://www.ncbi.nlm.nih.gov/m/pubmed/11377087/

He said someone mentioned that proscar was put in 120 degree F for 6 months and only degraded 1.4%. How much truth to this is there. Not sure if it's the correct pubmed article though.