The term "Paradise earth" never appears in the Bible. The word ‘paradise’ is used 3 times in the NT. Luke 23:43, 2 Cor 12:2-4, Rev 2:5-7.
Revelation 2:7 "Let the one who has an ear hear what the spirit says to the congregations: To him that conquers I will grant to eat of the tree of life, which is in the paradise of God."
The WT identifies this as heaven in Insight on the Scriptures, Vol 2, p 576. “ Since other promises given in this section of Revelation to such conquering ones clearly relate to their gaining a heavenly inheritance it seems evident that "the paradise of God" in this case is a heavenly one."
The second scripture in 2 Corinthians 12:2-4, which clarifies by itself that paradise = third heaven.
The only scripture left is Luke 23:43. The Watchtower attempts to explain that Luke refers to an earthly paradise.
Watchtower 1983 October 15 p.4 Does the Bible Promise and Earthly Paradise "To such ones who had the hope of being received into heaven, Christ promised: "To him that conquers I will grant to eat of the tree of life, which is in the paradise of God." (Revelation 2:7; John 16:33; 1 John 5:4) This figurative "paradise of God" is in the invisible heavens. However, is it correct to assume that heaven is the only paradise set before all of Jesus' followers? Since the sympathetic evildoer did not conquer the world by pursuing a course of faithfulness to God but was justly being put to death for his wicked deeds, what Paradise did Christ promise him? Indeed, the Bible does promise an earthly Paradise!"
The quoted article shows that the Revelation reference to paradise is heavenly and provides no evidence that Luke 23 refers to earth. The Watchtower reasoning given is simply that it supports their doctrine. Jesus specifically states that the man on the cross will be "with him" so it follows that this would be in heaven.
Also, all the scriptures that mention the resurrection in the NT are talking about heaven. ( i.e. Matthew 6:20-21, John 14:2-4 Romans 6:3,5, 1 Corinthians 15:42-50, 2 Corinthians 5:6-8)
Paul mentioned the “hope of the resurrection”, which he himself entertained. His hope was to be resurrected in heaven. John 5:28, 29 doesn’t specify that the resurrection will take place on earth either, rather that those in the tombs would ‘hear Jesus’ voice and come out’. They don’t literally come out of the tombs; even JWs say God will recreate them from memory.
Isaiah and Psalms mention texts describing perfect living conditions, like Psalm 37 and Isaiah 65. They are Jewish restoration prophecies for their deliverance from Babylon.
"The initial fulfillment of Isaiah 65:17-19 involved the ancient Jews who, as Isaiah accurately predicted, did return to their homeland, where they reestablished pure worship." Watchtower 2000 April 15 p.10
Insight on the Scriptures, Volume 2 pp.381-382 "This prophecy was initially fulfilled in 537 B.C.E. when the Jewish remnant was restored to Jerusalem"
Isaiah 65 states that there will continue to be children and these blessed Israelites will fulfill their days, grow old and die, certainly not possible in the everlasting paradise the Watchtower promises.
These restoration prophecies can’t be used to prove a paradise on earth because: there is no mention of a secondary application, they mention that people will grow old and die, they discuss a new heavens and new earth.
The Bible mentions the new heavens and new earth as a future hope for all believers in 2 Peter 3, Rev 21. Some think there will be a new earth created after Christ’s reign. Others think that God’s purpose and its fulfillment aren’t revealed yet.
