Defraggler does not recognize W10 Storage space

Defraggler reports W10 Storage space as an SSD, hence I cannot defragment it.

Windows 10 'Storage Spaces' are neither SSD or HDD. (or could be both, depending on how you want to look at it).

They are logical/virtual drives that are 'pooled' across several physical drives.

The physical drives in the 'pool' could be a mix of different types of drive, and of different formats - so because of that the 'Storage Space' cannot normally be defragmented.

https://support.microsoft.com/en-us/windows/storage-spaces-in-windows-10-b6c8b540-b8d8-fb8a-e7ab-4a75ba11f9f2

https://www.dummies.com/computers/operating-systems/windows-10/working-windows-10-storage-spaces/

A fairly comprensive guide to Win10 Storage spaces:

https://techgenix.com/windows-10-storage-spaces/