Hello Eric,
Thank you for posting question on Microsoft Windows Forum!
Based on your query of whether there will be an (paid) extended security update for this (ESU) and what year will it go out to, 2032. The straightforward answer is NO. Microsoft has not announced an Extended Security Update (ESU) program for Windows 10 IoT Enterprise 2019 LTSC (Version 1809) beyond its existing end-of-life date of January 9, 2029.
If your hardware target requires support out to 2032, it is recommended to perform an in-place upgrade or migration to Windows 10 IoT Enterprise LTSC 2021 (or a newer LTSC release, such as Windows 11 IoT Enterprise LTSC) before your 1809 instances reach January 2029.
You can consult the following articles for further reference.
Hope the above information is helpful! If it is. Free feel to hit "Accepted" for benefitting others in community having the same query too.