The short answer is no, Satanism and Demonolatry are not always connected. And yes, You can be involved in Demonolatry without being involved with Satanism.
Demonolatry and Satan is a tricky topic... when I was active in the online Demonolatry community, most of the Demonolators that I knew were fairly adamant that we were not Satanists, yet Satan figured in many of the personal primary pantheons as the supreme Divine/Spirit/All/whatever. But you didn't work directly with Satan and the relationship was very different than the relationship with the Demons. So while Satan is there for many Demonolators, He is not a large or active part of the path, if that makes sense? So you can absolutely 100% be a Demonolator and not be a Satanist (I am, though Demonolatry is not my primary spiritual focus these days).
So... there's actually a fair bit of misconception within the various communities about what each other actually are and what each other believes. There are some underlying similarities and common concepts that tie Satanists and Demonolators together (just like there are some that tie Satanists and Luciferians together)... but there are just as many differences. The thing to remember is that Satan the deity/entity is not necessarily the central theme/focus of most forms of any of these paths. So you can't use belief in Him as defining factor for any LHP (yes, even Satanism). Demonolators tend to include Satan as the 'All', but that doesn't necessarily translate into anything meaningful for them in practice. Theistic Satanists do tend to believe in Satan as a primary deity and may work with Him or worship him in some significant manner. They may also work with other entities (even Demons) in a lesser or equal capacity. But non-Theistic Satanism is different, and some Satanists are atheists and don't consider Satan to be 'real' at all. So it's hard enough to lump all Satanists in the same category, let alone lump Demonolators in with them too. Just because Satan seems to be a common denominator in all these paths doesn't make them intrinsically connected.
I strongly disagree with the statement that Demons are devils and the subsequent inference that Demonolatry is the same as devil worshipping. But we may have different definitions for 'devil', which would account for that.
Yes and no. Mostly it depends on which Demonolators you talk to and which entities their personal pantheon includes. But yes, there are a bunch of Demons who are demonized deities from other pantheons. The majority of Demons though, are not attested to in other faiths or pantheons. So They are not 'just gods who were demonified' by another belief system. Some are, most aren't.
And back to the OP and the original question... S. Connely and her buddies are the most prolific of the published Demonolatry writings, and were the leaders of the biggest online community before they took it all down. But if you'd like to contrast her writings against those of a Demonolator who IS a Satanist, then I suggest you go here:
http://www.infernaldialogues.com/
Sometimes the best way to see the differences is to actually look at the two different variations directly.
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