I see what you mean, a re-vamped Mint section. If you know how to change the references in the URL you can find the Jan menus, see below for the bold print which appears to be what changes month to month. I'll send JetBlue Customer care a note about the problem too.
https://www.jetblue.com/flying-on-jetblue/mint/menu/2018-11/MintMenu_
Nov18_B_E_LAX_V01.pdf
https://www.jetblue.com/flying-on-jetblue/mint/menu/2019-01/MintMenu_
Jan19_B_E_LAX_V01.pdf