Well, did you just read my post? WHO basically says no point not moving around...
This isn't actually what they say. What they say (to governments) is don't ban travel. One reason for that is that you still get travel, but by back door routes - people try to get round the bans, but in ways you can't monitor, so you end up with potentially even worse transmission. That makes travel bans pointless, and yet costly, because you lose some of the vital things we need to do to keep society going from happening.
They are not saying people not travelling doesn't make a difference. Of course it does. It's just that travel bans don't necessarily work as a way of making that happen.
Not are they saying that it doesn't make any difference to individual risk not to travel. Again, of course it makes a difference if you can avoid going to places where you can catch and spread the virus.
It's banning travel the WHO advise against, not avoiding travel. And even then, that may only apply while normal life is otherwise generally going on - they're not saying quarantine (the ultimate travel ban) is pointless.
If we all practise good social distancing, including not going to busy places, it will make a difference to how this goes.