If the phenomena you are highlighting is that Animal Welfare gets a smaller share of funding than people would prefer, it seems very strange to 'blame' AI messaging, since AI risk also gets a smaller share of funding that the surveys suggest would be preferred. Based on your methodology, the phenomena to explain is why does global welfare get so much more.
There doesn't seem to be anything gained by being negative about veganism though, and not doing that would seem robustly better.
Being seen as honest about the problems with veganism raises their credibility with their other recommendations. "Oh yes, we're not like those annoying people you've already rejected, we have a different view".
Quite possibly they infer this must be the most exciting new product, feel FOMO, and arrive even earlier the next day? Restaurant behaviour is weird - see for example how long lines are seen as a sign of success rather than mispricing.