What scared me in that thread was the mention of the fake lubuntu site that is still up since someone took over the old domain last year(?). I downloaded and installed lubuntu just some week ago. Luckily I am pretty sure I downloaded it from the real site. The fake one only has downloads up to 19.04 or something.

Have not installed Lubuntu in a few years, so never noticed any of the news of the domain change and take-over. Did not really find anything more about it when searching today?