I can't use LST in the new Bad Batch and it's been a year already

Yes I also want to know this 

Would like to mention that it says around one year, not exactly - though I doubt CG is using that loophole, they’re just too lazy to make good on their word

Well you can use the Bad Batch LST on New Batch characters.

Also, I don't think there's any backward compatibility.  What I mean by that is, you can't save an old LST in the hope of a character that wasn't allowed at the time becoming allowed due to becoming a legacy character at a later date.  (I'm sure I could have written that more concisely!)

Fijate que en los lsts del coliseo pone, en la parte de requisitos "Se lanzó en la era de aprendices o antes" 

Fijate que en los lsts del coliseo pone, en la parte de requisitos "Se lanzó en la era de aprendices o antes"

Cg please respond to this I spent money farming the new era toons in expectation they would be allowed for Ls tokens.

"Don't hoard! A LST is tied to a specific list of characters when it's released, and that list will never be updated to include units released later."

Source: https://forums.ea.com/blog/swgoh-game-info-hub-en/game-changes--new-item/12373006