Those renderings have been around for three or four years, even though the instagram post is recent. But I do like the use of glued laminate timber that they show in the construction, although it's very expensive and doesn't exactly suit the Luton neighbourhood. At the Triangle though it would look really good, and tick the environmental box. My company did a few public realm projects with it and it's a stunning looking product, and incredibly strong too.
24/30 months build time is not unusual. In fact we did have 18/24 months in the schedule, as we don't have the demolition and site clearance that Luton have on their site.