He's not even correct about it being six months; it was three, and that was a courtesy, not ever a rule for waiting before picking up a series, though groups like Jaimini's Box tried their damndest to have it be adopted as a rule to force people away from the lucrative works they scanlated and hid behind paywalls to force "donations". Also, rather obviously, but if you try to contact them and they don't respond even back then it was accepted so long as it was noted and was factual (the other party coming out and saying "no, they didn't contact me" generally made them be viewed very poorly).
Now, this said? Many series are delayed because of raw releases only coming out every so often, and then the team needs to work on it before releasing their scanlation. So just looking at the time between releases helps get a sense of that.