I still think the numbers will be skewed heavily by those that travel internationally 0 times per year, but I think your math is accurate from what I can tell. Essentially, less air travel is good if you regularly travel, otherwise not so much.
How’s the math turn out if people use alternate means of travel? Is traveling by boat still a thing?
You are assuming the majority of people lie in interviews. That is a strategy, and one my parents actually recommended, but I dont think its the most effective.