This is not really a new rule. Airlines can still place restrictions on where a ticket must be issued. The IATA rules did change as fare as SITI/SOTO/SOTI/SITO, but it has not affected these types of fares. The LH Z class fares between Europe and South Africa are a very good example:

12 TICKET RESTRICTIONS -
TICKETS MUST BE ISSUED:
IN AUSTRIA/BELGIUM/SWITZERLAND/CYPRUS/CZECH REPUBLIC/
GERMANY/DENMARK/ESTONIA/SPAIN/FINLAND/FRANCE/UNITED
KINGDOM/GREECE/HUNGARY/IRELAND/ITALY/LITHUANIA/
LUXEMBOURG/LATVIA/MALTA/NETHERLANDS/POLAND/PORTUGAL/
SWEDEN/SLOVENIA/SLOVAKIA/NORWAY/ICELAND/TURKEY
NOTE: TICKETS TO BE ISSUED IN AUSTRIA/BELGIUM/
SWITZERLAND/CYPRUS/CZECH REPUBLIC/GERMANY/ DENMARK/
ESTONIA/SPAIN AND CANARY ISLANDS/ FINLAND/FRANCE/UNITED
KINGDOM/GREECE/HUNGARY/ IRELAND/ITALY/LITHUANIA/
LUXEMBOURG/LATVIA/ MALTA/NETHERLANDS/POLAND/PORTUGAL/
SWEDEN/ SLOVENIA/SLOVAKIA/NORWAY/ICELAND/TURKEY ONLY.