Happened at my workplace. An phishing email went out to test how likely people were to click the link.
Anyone who clicked the link had to take phishing training. Anyone who forwarded it to our internal “hey this is a phishing email” service also had to take training… because the internal service would automatically click the link.
Based on your systemd output, it looks like the system is taking a long while to decrypt your drive. Is it a spinning disk, or an SSD?
I’m not sure if the PC repair shop specifically checked your drive, but it might be worth swapping out for another. Or maybe run some speed tests and/or diagnostics to see if there’s something funky going on.
You could also try an unencrypted install to see if the problem persists.