Correct, the foundation owns the logo and we are still in the process of registering it as a trademark, so that we can provide a re-use policy afterwards. For the time being, do an individual request to info@openhabfoundation.org and we can check how to best proceed.
This is the part that only considers the “technical artwork”. But also note that Wikipedia writes:
" This work includes material that may be protected as a trademark in some jurisdictions. If you want to use it, you have to ensure that you have the legal right to do so"
Note that it also says that this is public domain, but I guess you’ll be quickly in some trouble if you start using it for your own business 
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