Pope Francis' mentions the Sacred Heart devotion but in connection with his own language of "compassion" and "mercy," which may be compatible with sentimentalism but may not be compatible with law or the good. Charity separated from truth.
CNA: ‘The heart of the Church’s mission is prayer,’ Pope Francis says
Catholic Herald: The time is ripe for a revival in devotion to the Sacred Heart by Fr Alexander Lucie-Smith
Can the devotion to the Sacred Heart be separated from Latin soteriology and its concepts of merit, atonement, expiation, and reparation that are logical consequences of it? (It has also been linked to the modern Latin devotion to Christ the King, cf. the reference by Pius XI to Quas Primas in Miserentissimus Redemptor.)
Consecration to the Sacred Heart. Pope Leo XIII - 1899 - Vatican.VA
Miserentissimus Redemptor (May 8, 1928) | PIUS XI
CARITATE CHRISTI COMPULSI Pope Pius XI 3 May 1932 Sacred Heart - EWTN - Vatican.VA
Haurietis Aquas (May 15, 1956) | PIUS XII