I'd like to specify what said is not technically correct. First of all, being a mod update and not a new mod release, the new rule doesn't apply. Secondly, the new rule isn't about letting only a modder release a particular game, it's the opposite. We greatly allow releasing alternative versions of the same mod (by different people), but as I just said, they must be alternative which means, applying it to Hosted Games, you can release a 90% stats boost mod, if the other one available is 50% (or less) as it'd be an alternative mod because very different, and you can release it even if there's already a mod with 80% stats boost and you're gonna provide just a 90% stats boost mod, which wouldn't fit the alternative means of the new rule, but as soon as there's team work, and the original modder is aware of what you want to do with his previously released mod, you can still release it.
The new, and misinterpreted rule, aimed at having a team and not individuals modding a game, which would mean learning more, improving a game and really helping a community, which would also have had to make modders understand that we're a team and as team, we should all act together, and not individually. This said, isn't forced to update his mod if he doesn't want, but I invite him to not justify this by mentioning a rule which isn't related to this case.