No, trackless trams are not buses (or trolley buses). They are being pioneered in China and are much bigger than buses, carrying 280+ passengers each. They have no track, nor overhead line, so have much lower capital costs than traditional trams, but with similar or better performance (around towns, due to rubber wheels), and far greater flexibility. They are battery powered, with charge topped up at some stops or the terminus. They are guided by painted lines on the road or a small conductor embedded in it, to give potential for autonomous running.
There has been a system spoken about for Liverpool (the Lime Line) connecting the whole waterfront, with a spine running through the city centre up to the "knowledge quarter". If segregated routes could be identified, I think this could really help to pull BMD into the city centre properly.