Invoice against 0.1 tax

Yes correct .
As per Notification 41/2017 IGST rate :
when goods have been exported, the registered recipient shall provide copy
of shipping bill or bill of export containing details of GSTIN and tax invoice of the registered supplier along
with proof of export general manifest or export report having been filed to
the registered supplier as well as jurisdictional tax officer of such supplier.

note : The goods must be exported within 90 days from date of Tax Invoice of supplier.

Else supplier is liable to deposit balance output tax(normal rate) with interest.