digdeeper, did you read the quote above you from 1988? I was a jw for over 50 years and the WTS has taught there has been two fulfillments of Jesus' words, a partial then complete fulfillment. Here are some of their explanations.
*** w52 4/15 p. 252 par. 16 Aids for Understanding Prophecy ***Prophecies that have three fulfillments are said to have, first, a typical fulfillment; second, a miniature (the reality on a small scale) or partial fulfillment; and third, a complete (the reality on a full scale) or final fulfillment.
*** w99 5/1 p. 12 “These Things Must Take Place” ***Another Fulfillment to Come--However, that was not the finale. Earlier, Jesus had indicated that after the city was devastated, he would come in Jehovah’s name. (Matthew 23:38, 39; 24:2) He then made this clearer in his prophecy uttered on the Mount of Olives. Having mentioned the coming “great tribulation,” he said that afterward false Christs would appear, and Jerusalem would be trampled on by the nations for an extended period. (Matthew 24:21, 23-28; Luke 21:24) Could it be that another, a greater, fulfillment was to come? The facts answer yes. When we compare Revelation 6:2-8 (written after the tribulation on Jerusalem in 70 C.E.) with Matthew 24:6-8 and Luke 21:10, 11, we see that warfare, food shortages, and plague on a greater scale lay ahead. This greater fulfillment of Jesus’ words has been occurring since World War I erupted in 1914.
*** w95 11/1 p. 31 Questions From Readers ***We have often published evidence that many things Jesus foretold in this same discourse (such as wars, earthquakes, and famines) were fulfilled between his uttering the prophecy and the destruction of Jerusalem in 70 C.E. Many, but not all. There is no evidence, for example, that after the Romans attacked Jerusalem (66-70 C.E.) “the sign of the Son of man” appeared, causing “all the tribes of the earth” to beat themselves. (Matthew 24:30) Hence, that fulfillment between 33 C.E. and 70 C.E. must have been merely an initial one, not the full or large-scale fulfillment to which Jesus was also pointing.
*** w94 2/15 pp. 12-13 par. 20 “What Will Be the Sign of Your Presence?” ***His prophecy accurately foretold things leading up to and encompassing the destruction of Jerusalem, and it mentioned some things to follow 70 C.E. But most of this was to have a second and greater fulfillment in the future, leading up to a great tribulation that would end the present wicked system of things. This means that Jesus’ prediction at Matthew 24:4-22, and the parallels in Mark and Luke, were fulfilled from 33 C.E. through the tribulation of 70 C.E. Yet, the same verses would have a second fulfillment, which would include a greater tribulation in the future. This larger fulfillment is with us; we can see it daily.