As you do not have a separate work account listed under "Accounts" in "Settings", you do not have an AAD account installed. On my main laptop I have a work account installed. On my "Insider" laptop, I can also connect to the work account, but then in the browser.
To avoid 365 consistently logging me into my work account, I use a separate browser when connecting to work with my "Insider" laptop.
No I do not have a work account registered but on "Accounts" => "Emails and Accounts" I do have a work account listed...So am I on an AAD account or nah?