I think there are plenty of deflationary tokens on bsc that burns supply. Technically almost all shitcoins are using this feature as their main ingredients for marketing. The word deflationary becomes more often to used due to the famous projects thats started it.
Hodl tokens, catecoin, bonfire, ass tokens and many more. These tokens burn some of their supply that has been traded across the dex.
I guess he means something that has a programmable burn? Like those crypto that automatically burns the miners fee so that the supply reduces with the volume of transactions, and encourages people to use it more. Models like that work in theory but like you said, it's just marketing tactics in the end.
Tokenomics don't work well because there are no users. Just speculators.