Alas, not so
If only that were the case.
Apple now *require* publishers to offer an in-app single click option if there is an outside-app version, *and* publishers can't provide links to external locations where the outside-app version is *and* publishers can't offer better prices outside the app.
I wouldn't mind if we had equal opportunity to promote our own version, but I think few end-users will see the choice of 'click here' versus 'go to your web browser and type this address in, and then go through hoops' as being competitive; Apple now require us to cripple our outside app systems so the in-app version is far superior for the end-user.