This. I've already gone on record saying I don't believe this was a giant "conspiracy," as others have alluded to or stated outright. That sort of reasoning is just a justification for emotions that are too close to the surface.
However, your post (and
@Ramble1885 's earlier post) made me remember the aftermath of the infamous Jasper Sanks game in the late 90's. After that play was ruled a fumble and Georgia lost the game, the SEC investigated the officials from that game. And the SEC ruled that those refs had made a big mistake. As a result, they fined the refs. What's more, those specific refs were scheduled to officiate the SEC Championship game the following week. After the SEC decided they had made the wrong call,
they were removed from the SECCG, which cost them a substantial bonus as well as reputation in the industry.
I should also point out that in non-conference games, I've never heard of the SEC proactively reviewing a non-conference game where an SEC referee made a bad call that cost the other team the game. (It may have happened, but I haven't heard of it.)
So the SEC sent a clear message after that game. As an official who works for the SEC, and who relies on the SEC to schedule you for the bigger games and growing their pay each year, you're definitely aware: if you make a controversial call that costs an SEC team an out-of-conference game, you're done. Your livelihood is on the line.
So I would not at all be surprised if an SEC referee saw something questionable, but decided to keep the flag in their pocket because it was a gray area, and the game was too close. They subconsciously know not to risk those things.
This is also why I'd like to see non-conference games officiated by a crew from outside either of the playing teams' conference. They can and will still make bad calls. But at least there's not an obvious potential conflict of interest.