They've considered another way to make humans meat-intolerant:

https://www.weforum.org/agenda/2018/12/why-are-so-many-people-getting-a-meat-allergy/

EDIT: In fact, that same guy who is show in the video talking about gene-editing a meat allergy into us is quoted here suggesting using a chemical from the tick mentioned in the link above to do the job: https://alor.org/blog/stop-meat-eating-by-genetically-modifying-humans-by-brian-simpson

They've considered another way to make humans meat-intolerant:

https://www.weforum.org/agenda/2018/12/why-are-so-many-people-getting-a-meat-allergy/