No. Absolutely not. A helpful reminder of the timeframe would be "the deadline for our study is ..., please try to send your response by then if you wish to be included."
Quoting legal code is not at all a helpful reminder of a timeframe, but is a direct implication of legal ramifications for failure to comply.
People don't go through the trouble of digging up the particular section number of the specific statute of the specific jurisdiction in question for the mere sake of a generic "helpful reminder of the timeframe" required by law.
And similarly for the "without undue delay" part.
It's either a veiled threat or a serious error. Either way, this study needed more oversight.
That sounds like you're referring to the CCPA itself as the bureaucracy gone mad, and probably have already made up your mind about what outcomes research like this will find. If so, that's not really a helpful attitude for this kind of discussion.