Baking soda and vinegar fizzes up and produces gas. If you pour them down and then immediately plug up the drain, the pressure forces the grease through and prevents it from clogging up your own plumbing. It won’t do anything to prevent it from forming clogs in the sewers, though.
Baking soda is also a traditional way to clean grease: it’s an mildly abrasive powder that reacts mildly with grease, making it less greasy. forming, in fact, as discussed above, fatberg. One wonders if the idea of pouring baking soda and vinegar down the drain is just a poorly thought-out idea of pouring cleaning agents down the sink and hoping they work.
I put a link to this column in a recent post causing me to re-read it. I noted that it referred a lot to London and “flushable” wipes. Those two are in the news due to an “island” of wipes forming in the Thames, actually changing the flow of the river. Yeah, those are a problem.
(And I seem to be using “quotes” a lot in my “posts” lately.)