It is odd the phrasing used, in the original note: "first actual case of bug being found".
That makes me think of a couple of things: 1. Perhaps some of them were already referring to program errors as "bugs", or 2. They suspected before that bugs in the relays may be the cause of errors, but this is the first time it was confirmed.
A bit off-topic, but not too much: my kids, and all their friends, do not refer to programs or games as having "bugs" or being "buggy". The vernacular they all use (5th grade up through 9th grade) is "glitch"; e.g. the game has a glitch, or this program is glitchy, etc. I don't think I've heard them say "bug" very often, if at all, and I wonder if this is a new trend wider than just my kids and their immediate peers.