Hmm that is rather confusing. My understanding (I’m just another user trying to help by the way and nothing to do with Roon other than that.) is that the QNAP does not come with Roon pre-installed and you need to download and install it yourself, but maybe that is changing.
Lets ask @mike and @crieke to see if they can provide more details.
In the meantime see this thread and the links in it for more details. Again note the recommendations for a top of the line NAS with an i3 or i5, though Roon will work with any 64 but intel CPU.