I just read him/her as saying that people who avoid meat for health reasons would likely avoid this meat as well. Whether they're mistaken to avoid meat for health reasons doesn't seem specifically tied to artificial meat.

wiki has a number of sources: https://en.wikipedia.org/wiki/Vegan#Health_arguments

The claim is that there are individuals who believe veganism is healthier, not that it is healthier. I am not a vegan.