Funny cast iron melting: too cold ?

I stumbled upon this video about a guy using a charcoal powered cupola and a natural draft propane furnace and in both cases the cast iron was syrupy and the temperature looked more like copper.
When I (and others) melt cast iron it looks hotter and flows better.



It appears that the propane furnace does not forced draft which does not let the temperature beyond 1200 C which is too low for cast iron.

What are your opinions ?

 

Those videos need failures to get large amount of views (300,000).

 

The first pour looked like it was hot enough but the next pour was way too cold.