My chromebook isn't even listed (Acer Cb154-x) seems like the list isn't exhaustive.
Congratulations!
If the model number doesn't have a typo, it might be expired. Most of the ones not listed tend to be expired, and many vendors sell expired ones.
Oh ohs!
If so, you're in good company. Many less affluent, less educated families find themselves there. Some find they wasted $150 on a Chromebook which has a few months left, and some keep using it, and find their data held for a few grand in bitcoin.
Thanks Google!
But I suspect you have the CB514, not CB154, which IS listed, and which expires in 2024. If so, you've got almost four years left. Congratulations!