There's a few ways to interpret that. Another interpretation could be that they are simply taping out Navi32 on two nodes, perhaps for AMD to better utilize the 5nm slots they have access to. Perhaps when Nvidia is on Samsung 10nm+++, then the large consumer AMD GPUs get a node advantage already being at TSMC 7nm+++, and so they're only using 5nm slots for places like integrated GPUs and data center parts that care about perf/watt.
But your interpretation is equally valid with the information we have AFAICT.
But your interpretation is equally valid with the information we have AFAICT.