Why is the Gate 10 Terraces closed?

I always go to the Gate 1 Terraces as I much prefer it in there and am not a fan of the F Lounge.

Rarely seem to fly longhaul from T4 and if I do its normally an evening flight meaning a rush from the office to the airport, normally negating the need to head to the Gate 10 lounges for a Spa appointment first.

As a side note, on the pushback from Gate 17 (IIRC) to GVA the other night I saw the Hollideck lounge from the outside. Looks nice, any of the regulars here use it?

I assume its a Priority Pass lounge?