Well you do sound uninformed.
OR informed just enough to be dangerous - LOL
Here is a whole lot on this topic:
Production Chain Changes - API Announcements - Let's Encrypt Community Support (letsencrypt.org)
If he removed the last cert from that one site.
IT WORKS!
[total false sense of accomplishment]
But then every other site that has that long chain continues to fail.
Thus the "FIX" is not really a "FIX" for this at all.
For his system to work, every instance of that cert would have to be removed from the entire Internet.