Maybe I'm wrong about this, but it seems that SSDs do not reset the Date Modified attribute of a folder if a change has occurred within that folder (file created, moved to, etc.). Only HDDs seem to work correctly. I've tested this on multiple Win10 machines with multiple SSD's and none of them seem to respect that the folder has been recently modified.
Why is that? Is it due to trying to limit write cycles?
On an HDD - Add a new text document to the folder. In Windows Explorer, the folder date is modified to the current date.
On an SSD - not so much. The folder retains the old Date Modified.