They note in the post that this functionality is coming soon: > 2. Write a new plymouth theme based on the spinner theme which used the vendor logo as backgrou

They note in the post that this functionality is coming soon: > 2. Write a new plymouth theme based on the spinner theme which used the vendor logo as background and draws the spinner beneath it. Since this keeps the logo and black background as is and just draws the spinner on top this avoids the current visually jarring transition from logo screen to plymouth, allowing us to set plymouth.splash-delay to 0. This also has the advantage that the spinner will provide visual feedback that something is actually happening as soon as plymouth loads.