When Paul wrote 2 Thess 2 he was indicating to the Believers (the church in Thessalonika) that they would know they missed the Rapture removal of the Body of ALL BElievers IF they saw the man of sin revealed. It is AFTER the man of sin is revealed that the physical return of Jesus to the Mount of Olives is predictable. The counting ot eh two 3 1/2 yer periods of the Tribulation begins with the peace treaty/compact signed by the man of sin with Israel. The Tribulation comes upon the whole world, but the focal point during the Tribulation is Jerusalem and the Time of Jacob’s Troubles.
Agreed, the church the bride of Christ is taken and God is dealing with Israel, hence the 144,000 Jewish evangelist and theTwo Witnesses performing OT miracles. Matt 24 is to Israel. When you see the abomination of desolation flee — only can be Israel. Sure people from every nation and tongue are saved during this time. but it is God bring Israel to the point they will nationally say Blessed is He who comes in the Name of the LORD and they will weep for the past 2000+ years of rejecting their Messiah and King. Christ will bring in His Kingdom on earth to his promised people and all nations will bring worship to the King in Jerusalem.
You are entitled to believe whatever you choose to believe--however that is patently not true.
However you translate the words, they say that he will "confirm" a treaty; doesn't say the periods begin then.
In this case, if the words contemplate an existing treaty (such as the Interim Status Agreement 7 year performance standards); some considerable part of the initial half of the period may have already passed. Point is to read the material carefully--the language used does not literally translate into a period description (except at the time of the Abomination of Desolation event read in conjunction with the words of Jesus in the Ollivet Discourse in Matt 24:15 et seq..