It was just an idea floating around the circles I used to visit. I knew it improved posture so I tried it. I was also having lower back issues and general excessive computer use problems. Works well enough.
Deadlifts miss the muscles in the shoulder that tighten up from too much mouse + kb. I haven't found an excersize for that, which is as effective as deadlifts. Pushing your arms back in a door frame, holding your elbows above shoulder height, helps roll back each shoulder and stretch a tight muscle that goes from the top of your shoulder to the front of your chest that gets tight when hunched over a kb. That works in the short term, but it doesn't give the effective feeling of strengthening those muscles in such a way that the problem recurs much more slowly, like deadlifts do for your legs/back/neck.
I've tried hanging from a pullup bar and that certainly helps reset the shoulders/neck/head tension, but it's not a fix in the same way gaining strength is a fix.