No, "millions now living will never die" meant the entire worldwide population. It was only later that they said it was only the JW population.
Note what jwfacts says about it:
Who Were the Millions?
Russell had proposed that Watchtower followers were to go to heaven, whilst most of the remainder of humanity would survive Armageddon to be educated personally by Jesus in paradise earth.
"He takes mankind as he finds them, and during the Millennial age will deal with each individual of the world according to his own particular condition, having mercy upon the weak and requiring more of the stronger, …" Studies in the Scriptures - The New Creation p.114
Rutherford continued to promote this teaching. In the New System, freed from the influence of Satan, Jesus would directly teach all people and give them the opportunity to choose if they wished to live forever serving him. Salvation was not contingent on becoming a Watchtower follower, or even a believer in Jesus. In fact, the churches were criticised for teaching that their members exclusively would be saved.
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More often though, the Watchtower misleadingly indicates that the teaching of "millions now living" was overoptimism, as if the teaching back then coincided with the current doctrine that only Jehovah's Witnesses would be saved onto earth as part of the Great Crowd.
So this same exercise CAN be applied to the "millions" campaign. In fact, I think I should edit the site and make a second counter based on this!!