Definitely not dead; Vega is well supported, and with some tweaks, Polaris probably works too (although it definitely was broken in HIP around ROCm 4.0.0 or so).

I think AMD has some work to do on non-C++/Python ecosystem engagement for sure, but they've built a foundation that's quite easy to build upon and get excellent performance and functionality; AMDGPU.jl is a testament to that.