Brilliant!

Finally, something that disables Gutenberg autosave! All those sites saying to define the autosave interval in wp-config.php or to disable it by dequeuing this and that, alas they don’t work. Those settings relate to the classic editor. You can use Chrome Development Tools – Network – Filter: Fetch/XHR to see they don’t work, but this lovely plugin does! Really appreciate the work on this one, thanks!