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I've got the same timeline as yours. Security started in October 2023 and received GU's on Sept 27, Oct 4 & Oct 9. GU's are usually positive indicators, but if everyone is receiving them, it could be just general system updates.
My tracker also had updates on those two days and got updated again yesterday. It feels like IRCC has been picking up the pace lately. Fingers crossed we get some positive developments soon