The only way for the server owner to circumvent the filter is to mark a channel as "NSFW", which doesn't necessarily mean the channel actually contains any NSFW content.
This change will not actually require ID for content confirmed to be NSFW. It will require ID for each and every "NSFW mode" (unfiltered) channel. The end result is that you have three choices:
- Ditch Discord features implemented in recent years (or at least this is currently possible) - this prevents a server from being listed as public;
- Require ID checks from all your users (per channel);
- Have everything scanned from all your users (per channel).