The DNSL is very clear regarding proposals to not suggest, allowing no room for alternative "interpretations"...
- Any proposal to alter, delete, or limit plundering
The very aptly named "anti-plunder potion" would do exactly that, limit buildings that could be plundered. Thus, it does change plundering.
And while the suggestion is a different approach to limiting plundering than the more common ones posted in forum, I definitely would not agree it "would make the game more interesting." It's merely an excuse for folks to not learn all the ins & outs of a game that was designed to be very complex & dynamic.
Players don't need to be protected from plundering. They need to be gradually taught & learn over time ways to develop their cities so that plundering is only a minor nuisance, and not a detriment to their goals. This is very doable for anyone. But only if folks stop treating themselves & others as "victims", instead choosing to take up the challenges the game offers and grow.