So they were stress testing part of their infrastructure
I wouldn't get your hopes up about seeing this anytime soon for BT wholesale services for a long time.
Think of it like mobile phone releases, sure you could the "perfect" phone, right here right now,or you could squeeze the market for a while, then up the product or service, squeeze that for a while, up it again.
Anyone who wants high end services at the most will either be the select few that get hyperoptic but again very limited in terms of location, again slightly OTT for home use in its current state. Or other services supplying small, medium or large businesses, WAN infrastructure ala resilient Colo feeds between data centres or several dcs, but even those will be on a dedicated link
Unless you are one of those or are managing a tenanted building of some sort
Good too see the potential of what it can achieve though, and quite interested to read about this laser technology