They successfully trained LLMs on Lumi, which has AMD Instinct MI250X GPUs. This perhaps provides a hint about one angle on why AMD are interested.
If they’ve trained LLMs with lumi which has a lot of instinct GPUs there is a high chance they’ve had to work through and solve a lot of the gaps in software support from AMD.
They may have already figured out a lot of stuff and kept it all proprietary and AMD buying them out is a quick way to get access to all the solutions.
I suspect AMD is trying to fast track their software stack and this acquisition allows them to do just that.