Here are the flag sequences mentioned in the article. In my testing, this works only in Firefox (other browsers print nothing or a Black Flag followed by nothing).
🏴󠁧󠁢󠁥󠁮󠁧󠁿 🏴
🏴󠁧󠁢󠁳󠁣󠁴󠁿 🏴
🏴󠁧󠁢󠁷󠁬󠁳󠁿 🏴
Screenshot of how it should look:
A fail looks like this 
Breakdown
🏴 = Black flag
󠁧 = g
󠁢 = b
󠁥 = e 󠁮 = n 󠁧 = g (eng)
󠁳 = s 󠁣 = c 󠁴 = t (sct)
󠁷 = w 󠁬 = l 󠁳 = s (wls)
󠁿 = Cancel flag
None of this fun stuff should take away from the seriousness of the article linked up top. Unless I can be assured of my safety and security, I won’t be trusting any LLM on my local machine, inside or outside of TiddlyWiki.