Day 4: NW finally updated the Singapore lounge info on nwa.com late afternoon or evening:
Singapore Thai Royal Orchid Lounge
phone 65-6542-2874 Singapore Changi Airport Terminal 1, Transit Area 3rd Floor, at Lounge A Unit #031-66 3:00 a.m.-6:00 a.m.
Note the time restriction: 3-6 a.m. Previously there was no such restriction on use of the Skyview Lounge.
We used the lounges as WC members on 3 occasions this trip: 3/23 outbound on SQ, 4/1 inbound on SQ, 4/2 outbound on NW; only the 3rd usage would be allowed given the info now posted.
This is clearly a reduction in access as well as amenities. Good luck to any future NW flyers connecting onward through SIN.
It seems as though NW is working really hard to make the upcoming decision easier.