Yes, as you have found, CC has a long running, known, and unresolved bug where it reports HDD's as SSD's and vice-versa.
There has been no public, official word regarding any sort of resolution, so don't hold your breathe on that front, or for a fix I guess.
It's obviously not even on Piriform's radar is all anyone can tell of the issue.
Yes I had this same problem with my internal laptop drive. Keeps seeing my HDD as an SSD. So I fell back to my older version of Ccleaner 5.28.6005. The older versions still
allow up to 35 passes, to overwrite data. I keep two versions of Ccleaner in separate folders. The older version 5.28 I use for full wipes. There are other products on the market
that will utilize full wipes, but they cost. Perhaps with the retail version of Ccleaner, full wipes are possible? The latest versions that are free, seem to be crippled.
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Perhaps with the retail version of Ccleaner, full wipes are possible?
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The Wipe Free Space/Drive Wiper functionality is the same in Free and Pro ("paid") versions. The official download page shown here lists what the differences are: https://www.ccleaner.com/ccleaner/download