Many courtesy notices will not mention TBD, or they are written in such a way that many people will think that they are not eligible to use TBD. As long as your ticket is not a midemeanor ticket(DUI, wreckless driving, etc), by California law you may use TBD. Even for over 100 mph tickets, you can still use TBD, as long as you ask for TBD at the mandatory appearance.
It is sad that it seems that many courts actively discourage people from using the Trial by Declaration process. However, this is understandable given that this process requires a lot more paperwork and manpower for the court to administer.