Correct. When the total income number (not AGI even if it's the same number) is insufficient, this notice will go out. If your liquid assets are enough, then no problem. Will your income continue from the same source once you return to the USA? If so, be sure to take evidence of that, like documentation from that employer indicating your job will continue in the USA.
You qualify as a sponsor based on income that continues. The question about current income includes the words "you are using to qualify". If it's foreign income, you have to show it can be used.