No, it wasn't. If a woman can be First Officer, a woman can be captain. In most cases, a First Officer is in fact being groomed for captaincy at some point.Nah, it's a clear implication. It's just unpalatable because it's so dated. But, in 1969, it really was the intention that women couldn't be captains. Sorry.
Janice Lester was clinically insane. Why would anybody take her rantings at face value?