No, that's what you're saying - I'm not sure where your rephrasing comes from, as it doesn't correspond to anything I've written above.

I'm explicitly saying "it" [that is, forcing yourself to do things, like get in the sun, exercize, sleep less, better diet, etc.] does change something psysiologically, and does help, even in cases of non-situational depression.

The grandparent comment claimed that this helps only in cases of situational depression.