At the very least, data obfuscation obfuscates the shenanigans of a constantly asymmetrically redefined value store.
TPG just highlights the shenanigans which puts pressure on airlines to change the value even more frequently. This in turn makes the shenanigans more apparent which might call for regulation.
This lawsuit is attempting to nip this process in the bud before stumbling on regulation. But, fundamentally, the relationship is asymmetric regardless of any data api access.