It does allow streaming live streams.
Do I need a TV Licence for Netflix, YouTube etc? - TV Licensing ™
You may need a TV Licence to watch your favourite streaming services, including Netflix. Find out when it's required.www.tvlicensing.co.uk
If you watch live on streaming services (e.g. ITVX, All 4, YouTube, Amazon Prime Video, Now, Sky Go), or use BBC iPlayer*, you need to be covered by a TV Licence.
You don’t need a TV Licence if you never watch live on any channel, TV service or streaming service, or use BBC iPlayer*. On any device.
*A licence is not needed to watch S4C programmes on demand.
It really is straight forward if you read the Gov UK tv licence pages.
But it not straight forward, just because TV licensing (a private company) says you need it. until it tested in a court, it simply a private company offering advice. and i pretty sure if it does go to court that you need a Licence to watch YouTube (live), YouTube it self will fight it tooth and nail as being classified as a TV service would open YouTube up to being suided a lot more for the content it has