Ok, i guess I’m slightly surprised they would still have the boards available.
Apple https://support.apple.com/en-us/HT201624
"Owners of iPhone, iPad, iPod, Mac, or Apple TV products may obtain service and parts from Apple service providers, including Apple Retail Stores and Independent Repair Providers, for a minimum of 5 years from when Apple last distributed the product for sale."
"Service and parts may be obtained for longer, as required by law or for up to 7 years, subject to parts availability. Additionally, Mac notebooks may be eligible for an extended battery-only repair period for up to 10 years from when the product was last distributed for sale, subject to parts availability."
Being that your computer is from 2019, you should be able to get repairs until at least 2024 and maybe up until 2026. However, after your AppleCare expires, you will have to pay out of pocket for any repairs.