Yes - and it's just a suggestion at this stage. Some communities have a current problem with Vegemite being used in this way - but other substances currently aren't being used that way.
Vegemite is a particular issue because it's so ubiquitous. The number of people in these communities who are actively baking bread is small. But Vegemite is common. The local authorities would notice quickly if people started bringing in much more bakers yeast than before, but bringing in more and more Vegemite wasn't noticed.
Best wishes to them. Fermentation is such a ubiquitous process that it’s hard to stop determined people from doing it and producing a beverage ... but they might find tomato beer pretty disgusting and you’d need to down a gallon of it at a time, and then you’d have the trots ...