So I assume you took a backup before you did the install so you could revert if something failed.
But in the unlikely event that you didn't, now would be a good time to take a backup...
The likely reason has been explained a few times, but Iāll try to summarise: the machine was so strongly overloaded that Node-RED could not receive any updates with a new CPU load to state that it was indeed at 100%.
I'm a newbie in NR but I found high cpu usage and hang the PI4 when i played around with "flows".
A suggestion is to have a separate hardware with NR for testing and develop and when you think your flow is excellent just copy it it to the regular server, my homeass and Shinobi cctv server hanged when it was needed......
Oh, ok, I also just realised that I posted the dmesg from the wrong machine.
(Because I don't have this machine in question on line as much I default to the one on which I usually do most of the work.
Hey, at least I admit it and am now uploading the correct reply.)
However reading the new/correct one: I don' think there is a SD card problem.