Nothing - NOTHING - will convince me that they don't still release material that references their relationship, whether directly, indirectly, thematically, historically or in the present day. They developed a fairly simple and overt technique at the time of Rumours of speaking to and about each other in that way, when they couldn't communicate as people any more, and it has carried on, on both sides. And I'd suggest you have to be being wilfully perverse not to interpret at least
some of these 'latest' LB lyrics that way?
I also think that Kristen Buckingham understands completely the various roles that SN plays in her husband's life: muse, friend, colleague, nemesis ...
Really healthy relationships can cope with that kind of honesty and complexity. And of course it's all that much easier when you remember that SN doesn't actually want LB any more either!