There is some ambiguity in the fact that the list uses both a model number and a roll mark. It uses one or the other or both. It doesn't specifically state: Law Enforcement, (6920), Sporter (al), Match Target (all), AR-15 (all). With commas or separation. It lists them as line items. In the case of the 6920 it may apply specifically to the Law Enforcement model only. In the case of the Sporter Match Target, AR-15 it goes by the roll mark, not the model number. Knowing that the Sporter, Match Target, AR-15 are roll marks, and not model numbers I have always read the banned models in the code as being the Sporter, Match Target, Law Enforcement, AR-15 AND the 6920. Just to be safe. I may technically be wrong. This could become a long debate, and I can see good arguments on both sides. Any prosecutor could say it's plain as day, the make is a Colt and the model is 6920 it's banned. No matter what the roll marks say. That is the criteria used to determine legality, the make and the model by court decisions. The law states some are banned by roll marks, another by model number. So that's the ambiguity.
It's possible there is an addendum somewhere clarifying the Kasler v. Lockyer Assault Weapon List whether the list addresses The Law Enforcement 6920 as a single make and model or it applies to anything roll marked Law Enforcement and the 6920 model number with any roll marks separately. I just haven't heard of or seen that so I may be a bit behind on the clarification of this issue.
In either case regarding the OP and the LE 6920, that is in fact banned for sure.