I'm not sure why you believe this.
I quoted the actual text:
"1. No Party shall require the transfer of, or access to, source code of software owned by a person of another Party, as a condition for the import, distribution, sale or use of such software, or of products containing such software, in its territory."
It does not say no party can compel an owner, it says no party can compel access to the source code owned by person of another party. That is not "no party can compel the owner" it's "no party can compel access to source code that meets certain conditions".
Period. There is no "nobody can compel the owner" part in there that i see.
The only reference to ownership is around a pre-req to compulsion. IE if you break it down, it says:
"unless the software that meets the following conditions, you can't compel access to code
Conditions:
A. It's owned by a citizen of the party
or
B. It's not being done as a condition for the import, distribution, sale, or use of such software, or products containing such software, in its territory"