USB2 vs USB3 shouldn't be an issue.
Welcome to Linux DVB where this is an issue Not for every device ofc (didn't test if it works with that stick).
does that mean that I don't need to install any addons to get TV?
You need Tvheadend or VDR installed (that are tv server for scanning channels, epg and stuff) - addons avaible in repo, after you configured your channels etc there you need the Kodi addon to connect to this server (pvr.hts for Tvh and pvr.vnsi for VDR).