Its true that the Watch Tower magazines themselves have said virtually nothing on the gentile times for nearly 2 decades. But in at least two other recent publications, its described as fully as it ever was.
Maybe it just seems less well explained to us now vs the past, because we've personally since learned the information and insights that brings out all the faults and inadequacies?
e.g. from the Daniel book - mostly on pg.96 ----- its economical with the wording but all their usual points are there as far as I can remember.
26 Evidently, Nebuchadnezzar’s "seven times" involved seven years. In prophecy, a year averages 360 days, or 12 months of 30 days each. (Compare Revelation 12:6, 14.) So the king’s "seven times," or seven years, were 360 days multiplied by 7, or 2,520 days. But what about the major fulfillment of his dream? The prophetic "seven times" lasted much longer than 2,520 days. This was indicated by Jesus’ words: "Jerusalem will be trampled on by the nations, until the appointed times of the nations are fulfilled." (Luke 21:24) That ‘trampling’ began in 607 B.C.E. when Jerusalem was destroyed and the typical kingdom of God ceased to function in Judah. When would the trampling end? At "the times of restoration of all things," when divine sovereignty would again be manifested toward the earth through symbolic Jerusalem, the Kingdom of God.—Acts 3:21.
27
If we were to count 2,520 literal days from Jerusalem’s destruction in 607 B.C.E., that would bring us only to 600 B.C.E., a year having no Scriptural significance. Even in 537 B.C.E., when the liberated Jews were back in Judah, Jehovah’s sovereignty was not manifested on the earth. That was so because Zerubbabel, the heir to David’s throne, was made not king but only governor of the Persian province of Judah.28
Since the "seven times" are prophetic, we must apply to the 2,520 days the Scriptural rule: "A day for a year." This rule is set out in a prophecy regarding the Babylonian siege of Jerusalem. (Ezekiel 4:6, 7; compare Numbers 14:34.) The "seven times" of earth’s domination by Gentile powers without interference by God’s Kingdom therefore spanned 2,520 years. They began with the desolation of Judah and Jerusalem in the seventh lunar month (Tishri 15) of 607 B.C.E. (2 Kings 25:8, 9, 25, 26) From that point to 1 B.C.E. is 606 years. The remaining 1,914 years stretch from then to 1914 C.E. Thus, the "seven times," or 2,520 years, ended by Tishri 15, or October 4/5, 1914 C.E.29
In that year "the appointed times of the nations" were fulfilled, and God gave rulership to "the lowliest one of mankind"—Jesus Christ—who had been considered so base by his foes that they even had him impaled. (Daniel 4:17) To enthrone the Messianic King, Jehovah loosened the symbolic iron and copper bands around the "rootstock" of his own sovereignty. The Most High God thus allowed a royal "sprout" to grow from it as a manifestation of divine sovereignty toward the earth by means of the heavenly Kingdom in the hands of David’s greatest Heir, Jesus Christ. (Isaiah 11:1, 2; Job 14:7-9; Ezekiel 21:27) How we thank Jehovah for this blessed turn of events and for unraveling the mystery of the great tree!