t0nz did the exploit on Haven C box without updraft during the SEN-Knights series.
riot must be consistent in terms of exploiting, where is the consequences?
I'm sure riot is aware of this, it's been around for ages. If it hasn't been penalized until now, then riot thinks that it's legal and we can't accuse the players of cheating. If this is the first time we are seeing it in a public match and riot hasn't confirmed that it is illegal, then riot seems to allow it and no action can be taken against the players.
Edit: just to note this is IF it has not been stated as illegal by riot games and if riot games has not penalized other teams prior to when the exploit was used.