I can't really comment on the Syndrome; but the symptoms are familiar.
My observation has been that in my case numbness most likely is due to a prolonged reduction of circulation from holding the elbow bent at a sharp angle for a long time. The tunnel where the main artery goes past the elbow appears to be subject to a degree of compression and "collapse" when the elbow is held bent for too long a time.
In my case the degree of bending (especially at the elbow) required to produce symptoms may be related to how tissues (read that as how the fat) is distributed, as I've observed the symptoms more frequently when I was at "higher body mass" than during leaner times. This correlation is somewhat uncertain though, since my periods of high BM have usually also correlated with changes in the kinds of work I was doing and associated prolonged postures required by related tasks.
Similar symptoms, in my case, sometimes also are the result of resting a hand/wrist on the edge of a desk so that the vaguely similar "tunnel" where the artery passes through the wrist is restricted.
In my case, regardless of which "injury" - elbow or wrist - is responsible, the numbness is probably due to restriction of blood circulation. Both numbness and a degree of pain result from and in tissues deprived of fresh arterial blood.
I happen to have an incredibly marginal circulatory system due to inherited factors (thanks Dad!), additionally deteriorated due to "mature" age; but the numbness described here has been something I've been able to reproduce at will since adolescence.
Since the same "tunnels" that provide routes for the arteries also, generally, are the same ones, or closely adjacent to the ones, where major nerves "go through the joints" it's quite possible that similar symptoms could be observed from blockage of circulation as from constrictive pressure (a pinch) on the nerves. The symptoms described could be the result of either arterial blockage (compression by adjacent tissues) or nerve damage.
Of course, as previously noted, a pinched nerve in a remote place (like the neck) can produce pain in unexpected places (like the fingers).
I'm not sure whether it's feasible, or necessary, to determine which cause - arteries or nerves - is producing the pain, at least where it's caused in the elbow or wrist tunnels; although straightening things out and restoring blood circulation seems more likely to result in "healing" than relieving a pinch on a nerve. Most tissues can recover from brief insult, even if repeated fairly regularly; but nerves are generally less "repairable" once damaged than the more ordinary tissues such as muscles and tendons. The likelihood of a permanent recovery may depend whether the numbness is from circulatory or nerve insult - and it's reasonable to believe that in some cases both causes could be operable.
In my case, the symptoms are generally fairly easily relieved by avoiding joint positions and/or external pressures that I've observed as causes, although complete recovery often takes a few days if I've failed to respond quickly to the onset of symptoms. The longer it has lasted, the longer it lasts after "treatment" is begun.
Since I haven't attempted to relate my "symptoms" to any known/named "syndrome" this may be just unrelated babble; but the symptoms seem similar enough that someone "suffering from something with a name" may be able to relate my observations to what's going on in their own case.