If they are asking for your financials, it would seem highly likely they will use them in some way. Otherwise…why bother asking.
Is this what you are talking about.
ETA…CSU does not guarantee to meet full need for all. Even if only the custodial parent is considered, the aid might not be a lot. If the student is eligible for something like a Pell Grant based on custodial parent FAFSA, they will get that anyway.
If the school asks you to submit info…then do it. This would be for consideration for institutional grant money. That’s not guaranteed anyway at CSU