I would say it’s the opposite. There isn’t a lot of information about this but my experience was that you really need to wash your hair and scalp often if you have a hairloss. I’ve been doing “no-poo” for about 8 months and didn’t use shampoo for almost 4 months at one time. My hairloss got exponentially worse during that time. I don’t know if propecia just stopped working (which I doubt) or what but here I am, trying to reverse the damage with duta, which turned my hairline to sh*t.
I would say for majority of people that are suffering from hairloss to wash hair with shampoo at least once every 3 days. If you go to the gym and sweat a lot do it even more often.