I see but there is nothing to fear here. If St Louis de Montfort was wrong, he would not have been canonized a saint for inspired by the Holy Spirit he lived and taught the total consecration to Jesus through Mary and that is how he became a saint, and the Church canonizes saints for the edification of the faithful and to follow their example. He also founded two religious orders approved by the Church that still exist today, namely, the Company of Mary aka The Montfort Missionaries and the Daughters of Wisdom, that follow in his footsteps and his distinctive Marian spirituality of total consecration to Mary to be more perfectly consecrated to her Divine Son, Jesus.
The Company of Mary also administers with the approval of the Holy See The Association of Mary Queen of All Hearts (called the Confraternity of Mary Queen of All Hearts in the past) in which any of the faithful, clergy, lay, or religious, can be enrolled in. A person thus enrolled participates in the mission and Marian spirituality of total consecration to Jesus through Mary as taught by St Louis de Montfort and is in spiritual communion with the entire Montfortian Family. There are today 140 centres of the Association around the world, the headquarters being at the General House of the Company of Mary in Rome. The Superior General of the Company of Mary is the Director General of the Association, and it is he who establishes or suppresses branches or centres. Link to website of the Association of Mary Queen of All Hearts:
Also, the Militia of the Immaculatae or Knights of the Immaculata founded by St Maximilian Kolbe and six confreres is an International Association of the faithful by Pontifical right, i.e, with the official recognition and explicit approval of the Holy See. Any of the faithful, clergy or lay, can become a member of it. The Marian spirituality of this association is taken from St Maximilian Kolbe which is essentially the same as that of St Louis de Montfort, namely, a total consecration to Mary. St John Paul II canonized St Maximilian Kolbe. Link to official site of the MI in USA:
The Marian spirituality of St John Paul II was largely influenced as he himself says by the writings, teaching, and lives of St Louis de Montfort and St Maximilian Kolbe. His papal moto was Totus Tuus (Totally Yours). According to an article in the National Catholic Register on the book In God’s Hands - The Spiritual Diaries of Pope Saint John Paul II, it says:
The full version of his papal motto, taken from the writings of St. Louis Marie Grignion de Montfort reads: Totus Tuus ego sum, et omnia mea Tua sunt, Accipio te inmea Omnia, Praebe mihi cor tuum, Maria (“I am entirely yours, and all that is mine is yours. I take you for my all. O Mary, give me your heart”).