In both cases, as per the original announcement, both C2 and the C2 runtime in C3 are only being supported with "essential bug fixes and compatibility updates". Minor or non-essential reports will no longer be investigated. Basically that means if some browser update happened that broke all Construct 2 games, we'd fix it, but other than that we won't be doing any further work on it. Since this appears to fall in the category of non-essential, we won't fix anything involving C2 or the C2 runtime if you file an issue for it.
In other words, since February 2020, C2 and the C2 runtime are not actively supported, they're just being kept alive with essential maintenance. The purpose of the delay until July 2021 is merely to give you plenty of time to upgrade to C3 with the C3 runtime, with the confidence C2 won't suddenly stop working before then.