All those are STi blocks simply because that list isn't compiled for the gazillion other EJ20 toting Subarus.
The USDM Subaru Legacy Sport Sedan/Wagon all came with a closed deck EJ22. It was not made by STi either. I'm fairly confident that the earlier turbo motors came closed deck up intil the block was revised for open deck to improve the quality control on the casting process and to reduce costs.
Do a search for 'EJ20G deck' on google. You will find your answers.