Is this answer about Dask Scheduler fault tolerance still up to date?

If you mean this one "Dask is fault tolerant to the loss of any worker. It will fail if the central scheduler fails", then yes. But to be 100% sure about Dask questions like this, you can ask this in Dask Community discourse https://dask.discourse.group

That is true for both Dask and Spark. Here is a similar answer for Spark