I agree based on semantics and strength of force. The talk at Avco where I worked and where the delivery system for the RV’s was developed referred to the Mk-21 RV as having first strike capability due to the scalable power of the warhead and the extreme accuracy from 7K miles away.
In reality, in a shooting war, no military target in USSR was safe and with all of the submarine based systems, cities weren't either.
We used to have a good laugh at Avco when we learned that the USAF would notify Soviet spy ships prior to a test launch in the Pacific. USA was so sure of success and apparent accuracy that we wanted to let them know what they had to fear. We used to also monitor Soviet tests, when they were successful.
Unfortunately, we have nothing like that running at high preparedness levels right now...despite clear and present evidence of mounting nuclear threats.