Please don't PM users and bother them about their broken image links. You never know if someone might react negatively and report you for PM spam for whatever reason. Just mention their username and tag them here; if they want, they will respond. If not, give it up and don't bother them anymore.
I was about to ask this question. What if the author ignores your mentions too? I should give up as you said. User @SquirrelJulietGarden has a good thread about
Create Taproot address for your Bitcoin which was even mentioned in our local thread. I was very much interested but the images are broken. User SFR10 and I requested this user to fix the images by commenting in his thread but we did not get any response from him. So, I assume he do not use any kind of notification bot or he simply decided to ignore both of us? Could be?