He's not just talking about doing things, he's putting people to work doing things. To focus on his individual emissions is a premature optimization
Where is the line on how much pollution one is allowed to expel? 500sq ft per person apartment? 100sq ft? Prius or RAV4? Commercial flight to visit family, once per year or twice? How many kids?
I don’t have a problem with the dairy and egg products I use because I personally know the people that I get them from. I won’t purchase anything containing dairy and eggs. If someone prepares food for me containing them I may eat it to be polite but I wouldn’t eat meat. I also don’t have an issue with the honey I get from my friends hives. However, many of my activist friends and other people see all of these things as hypocrisy that perpetuate animal abuse. I still protest and we get along fine. Because to your point, there’s room for nuance.
And I don't buy that you can do your share by talking one way and doing the exact opposite privately. It's like being an animal rights advocate who (openly) tortures animals in their free time. Simply doesn't work that way, even if you save more animals than you torture.