Maybe not Mac & Cheese, but something has - could be doing it to part ways with Geoff, or he's seen the view numbers haven't been shifting and has decided to work smarter (less time spent liking/managing comments)
Why he's never decided to have separate YT channels for EV and Food/Travel is baffling, so it's possible this might be a precursor to doing that - doing stuff he "enjoys" on this channel and keeping the large subscriber count, then starting a second EV channel knowing they'll be thirsty enough to follow him over.