Apple have nothing to do with resound plans and BT 5.2 is enough to support this. It is entirely possible that the One could support BT LEA. Based on the information, this is good news! I am not ruling that out. The improvement that 5.3 over 5.2 is just to lower power consumption… Apple just supported the LE Audio through tBluetooth SIG
See my research on Resound LEWIS platform.