This is not an "Update", the change to the King of the North etc, by the Watchtower. It is a complete denial that what they taught as "truth", was in fact truth, it was nothing of the kind, as neither has been every rejected explanation of Scripture by them.
If you point this out, they come up with the phrase "Present truth", but , as Charles Taze Russell pointed out, if what was taught was truth, then "new truth" would simply add to that truth, if the latter was totally rejected, it was not truth.
They therefore show that they have mostly taught error, for 150 years nearly, as truth, and yet if you did not swallow down this utter Bullshit at the time, you would be out on your ear , and lose family and friends.