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Can this CSST be used for underground gas line installation?

Gastite says it can if it's insulated inside of a pvc pipe or conduit

That isn't Gastite, its branded as Gazflex-19.  That is a product that I remember being available about 20 years ago.  Was in pre ordered lengths, and fittings on ends already installed. Notoriously leaks as well.   Quickly googling I can't see to find install instructions from the obsolete product. 

Yep it's approved for underground.  I will post a Manual once I'm back at work.
Gazflex not Gasflex

But is gasflex the same thing as gazflex-19? I doubt it.

Attached is the GAZ-Flex manual I had sent to me.
Got this from Flex-pression of Quebec

Thank you all