Its an interesting note but it raises more questions than it answers. Sure SMA's contract when they heat, the robotics community has played with it as "muscle wire" for a long time (at least since the 90's), but in space its really hot, and then its really cold, and then its really hot, Etc. The difference in temperature between shade and sunlight is extreme. As the SMA doesn't care how its temperature changed, using it in such temperature dynamic environments is really really really challenging.

The second issue is that getting into and out of skin tight space suits is probably not #1 on the list. The issue is how do you bend your elbow? Even at 2 - 3 PSI, a 24" long sleeve (4" diameter cuff) has 650-975 pounds of force holding it "straight". That means you need a mechanical elbow joint which is both air tight and light which breaks the sleeve into two 'segments'. Astronauts get exhausted just opening and closing their hands while on EVA.