Pelvic shift/flexed in standing - gentle approach or tough love?

Former ortho PT working in home health - somewhat removed from current approaches - my young friend (late 20’s) has a lateral shift and that “tucked tail” posture that is typical of an “angry disc”. I advised him to work on shift correction in door frame and prone extension work - and to just deal with the discomfort as long as it resolved to baseline when he’s done “correcting”.

He started outpatient PT recently and they advised against extension exercises. He said that they said “ your body is telling you that it hurts to do that right now”. I guess I was always taught to try to force your body to normal posture - but maybe that’s old school?