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If we really thought about it, there will be a raising amount of people who don’t have a job and will not be able to get a job ever due to the decline in human labour needs, which lead to fewer jobs being offered globally which means that with fewer humans around there will be a higher chance for people to get a good job.
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Humans consume resources, with less humans around there will be more resources for each humans and they will collectively consume less resources in total.
You’re talking about the bottom 90% of the world and I’m saying that they don’t consume as much as the top 10%, so I’m focusing mainly on the top 10%. If we’re going to discuss resource consumption, the people we talk about should be weighted by the resources they consume. And by that metric, the global rich consume much more, and have fewer children, than the global poor. Therefore, it’s easy to point out that reducing birth rates won’t actually do much to reduce consumption, because the people who have kids aren’t doing much of the consuming.
The jet fuel is just an example of that general correlation, and one of several mechanisms why the childless tend to consume much more. You can argue “oh but all else being equal more mouths equals more resources” but I’m saying that all else isn’t even close to equal, so you should engage with the patterns as they actually exist in the world rather than a hypothetical where everyone is equal.