I just learned that Shield allows you to run custom scriplets!

So if you save this as a custom scriptlet at brave://settings/shields/filters:

window.addEventListener('DOMContentLoaded', () => {
    function removeCollapsedComments() {
        document.querySelectorAll('div[class*="comment_collapsed"]')
            .forEach(node => {
                if (node.textContent.startsWith("reply from someone you muted")) node.remove()
            }
        )
    }

    // Run on initial page load
    removeCollapsedComments();

    // Watch for dynamically loaded content
    const observer = new MutationObserver(removeCollapsedComments);
    observer.observe(document.body, { childList: true, subtree: true });    
})

and then save this custom filter:

stacker.news##+js(user-stackernews.js)

it also works!

P.S. your workaround proved me wrong because it spoke for itself.

The workaround mainly addresses one downside to the situation.

Creating a systematic, money-moderated approach to protect the community from (self-proclaimed) wealthy individuals using their economic power to manipulate the community is no easy task. We've all seen @k00b spend weeks thinking aloud in the saloon and comments of release posts, trying to find a solution.

The problem is that the system, being both open-loop and money-moderated, gives an advantage to those with external finances over those who don’t have as much. And let's be honest, that latter group is likely the majority, especially given the former "earn with posts" narrative.

This is why we want to show that even on SN, money isn’t everything. If we stand together and support each other, we can counteract a lot of the disruptions through simple actions. After all, we do live in a novel age of non-discriminatory empowerment now.

I'm not sure his memory persists between pages