It is true at least amongst the doctors I know. MDs and DOs learn the same curriculum DOs just have the not evidence based tacked on. A lot of DOs also prefer evidence based medicine and there’s not too much for at least half the osteopathic medicine techniques.
Since you probably don’t know osteopathic medicine references the techniques you probably know as chiropractic care. DOs still learn real medicine so don’t go scoffing at them for letters. I watched my DO friends/colleagues go through the same shit as my MD friends/colleagues