Thank you Guntis for the great report and very helpful maps! I'm planning to explore this trail tomorrow.
How long did it take you to get to the lake along the new trail? Do you have any gps data by any chance?
It took me 5 1/2 hours return from Nester's in Squamish...(2hr 15min ascent on trail), but that's moving pretty quickly. I would budget 3-4 hours for the 7km hike in, especially on a nicer day. I had no views, so no reason to slow down.
PM me your email address and I can send you the GPS track.