"Under the new rules, gender stereotypes would not be banned "outright", the committees said, because the evidence did not show that the use of gender stereotypes was always "problematic"".
in other words, they're not 'banning gendered stereotypes' - they're banning adverts that contain gendered stereotypes which are likely to cause harm, i.e. they're being judged on a case-by-case basis. kind of like their other so-called ban on "adverts that include gender stereotypes on grounds of "objectification, inappropriate sexualisation and depiction of unhealthily thin body images" -- yet we all know we see objectification and thin models all the time. it's just that a line needs to be drawn somewhere, those being on the extreme side.
other than that, i suspect this 'ban' will affect a small minority of morons who don't know how to advertise in 2018. don't remember the last time i've seen an ad that featured gendered stereotypes from the 1950s but then again i haven't watched tv in 5 years.