As in, ever. Under any circumstances. Not even “in moderation”. So, clearly, people who say “all things in moderation” are just using a tired figure of speech as a weak excuse to do things they know are bad for them. If you really thought that the thing that needs to be done in moderation was not bad for you, then the acceptable amount, i.e. “moderation”, wouldn’t even be in question.
We need to rethink the things that we do every day that need to be done “in moderation” and consider the fact that something that has even a small chance of causing addiction or reliance is something that can impair our abilities to determine what “moderation” even means.