Is ComputeBuffer.BeginWrite only supported on Vulcan?

I can only seem to get ComputeBuffer.BeginWrite to work using Vulcan rendering. Is it possible to use that method without Vulcan or am I missing something?

https://docs.unity3d.com/2020.1/Documentation/ScriptReference/ComputeBuffer.BeginWrite.html

I'm following this blog in which the author also mentioned that he could only get it working on Vulcan.
https://www.sebaslab.com/the-1milli...-a-freakload-of-cubes-on-windows-using-unity/