I was hoping that I wasn't going to have to add the "of course, unless the thing that ultimately owned the software was based out of another country" qualifier to that statement.

I guess I should have. :(

> ...domestic companies would justifiably be upset at being subject to harsher rules than foreign companies.

As I read it, nothing in the quoted TPP section precludes software purchasers from making access to source code a requirement of purchase. It prohibits governments from blocking the sale of "foreign-produced" software in their country if the software owner refuses to make the source code available.