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I'm guessing I'm reading the serial number charts wrong.
No, where you went wrong was using one of these charts to begin with 馃槣
They are not a reliable resource for modern pieces as they were not intended for them. Using one of these charts to date a modern watch will lead to confusion, such as you are experiencing. These charts are better for dating vintage watches.
We can date Non-Speedmaster Omega Watches that were manufactured between 1895-2012.
Did you perhaps use this one?
https://www.emmywatch.com/db/serial...tY3pGffm34WPiT5HPT4oA0LyIlmqAmBTZfSnigFOy-Kkb
If so it dates my Seamaster trilogy to 2008 which is clearly wrong as it was only introduced in 2017.
Also it has this stated;