This code was indeed last updated when its accompanying video was recorded. I understand we decided to kept the two "in sync" to let the code match what's seen in the video.
The documentation of Audio Toolbox these days includes many examples illustrating these and more workflows and I would encourage to refer to those first.
If you are still interested in using this code with a more recent MATLAB release, you can try to upgrade it yourself by replacing the discontinued helper object audio.internal.visualizer.Filter with the newer dsp.DynamicFilterVisualizer. Other small updates may be necessary.
If getting a working version of this code is important to you and you can't easily fix yourself, please message me privately and I will do my best to help.
