Jehovah's Witnesses, Is it true that the WTS once taught that: ?

The second presence of Christ started in 1874 (WT, 11/1/22, pgs 332-337; Prophecy, 1929, pg 65-66); Vaccinations never saved a human life, doesn’t prevent smallpox, and are condemned (Golden Age, Feb 4, 1931, pg 293-4); The great pyramid of Egypt is a witness of the Lord (WT May 15, 1925 pgs 148-9); God governs the universe from a star called Alcyone (Thy Kingdom Come, 1903 Ed, pg 327); Leviathan of the Bible is the steam locomotive (The Finished Mystery, pg 84-86); Tonsillectomy is condemned; better to commit suicide than have a tonsillectomy (GA, April 7, 1926, pg 438); In the new world, Abraham will rule New York City (GA, Oct 5, 1927, pg 26/29); The black race originated with Noah’s curse upon Canaan (GA, Jul 24, 1929, pg 702); Jews are no longer important to God (Vindication, Vol 2, pg 257-258); God wears clothes (GA, May 19, 1926, pg 534); The WTS stands for the principles of Nazi Germany (Yearbook 1934, pg 134-137); Aspirin is the menace of heart disease (GA, Feb 27, 1935, pg 343-4); Do not use X-rays (GA, Sept 23, 1936, pg 828); In 1938, people should not get married (Face the Facts, pg 46-50); Organ transplants were condemned as cannibalistic (WT, Nov 15, 1967, pg 702-4)? The WTS teaches that it is the mouthpiece for Jehovah and God’s one and only channel of communication to the world. Since God does not tell lies or change his mind (Num 23:19, Ps 89:34, Heb 6:18), and since it is clear that the WTS could not have possibly been speaking for God when they proclaimed these teachings, then how do you know that the WTS is speaking for God now? See Zeph 3:13 and Isa 28:15.