I've botted nmz on my account which was banned in April of this year and not had any issues. Only doing 2-3 dreams p/day but the account is a 1 defence pure so it doesn't last very long anyway with absorbtion potions. I tend to do the prayer method. I wouldn't go too crazy and even then I "recover" the account and disable the authenticator as well as use a proxy if I do bot on the account so it looks as though it was hijacked just incase I do get caught I can make it look as though it wasn't me botting.
Though, I haven't botted for about 2 month now, just do some afk skills.
TL/DR;
NMZ is completely safe as long as you bot smart, bot as though you would play (bot as many hours as you would play legit in a single sitting) but always expect that you can be banned.