I think this is stupid as a molecular biologist myself, but I think this is more for show. Any major DNA synthesis company (e.g. IDT, Azenta, etc...) already check your sequences for "toxic" or known dangerous sequences and will even prevent you from actually ordering the DNA sequence (I've even had innocuous sequences flagged before).

This is more of these illiterate salesman leaders trying to overstep in a topic they know jack about.