I very much doubt it; ultra thin doubleshots are hardly worth the risk to ship internationally.
They look decently thick to me to be honest. You have to consider the clear shot + black shot.
Also I've typed on them before (my friend owns one), they feel closer to thick PBT than thin ABS.
Doesn't JT keycaps have the capability to do doubleshot with a clear shot for legends? I thought I read about it somewhere.
Possibly, if you look at the under side of the JT keycaps, they look similar in concept though granted JT Keycaps is a bit thicker.
Though I feel like everyone just write them off before actually trying them.
EDIT: Found out they're actually 1.5 mm thick, which is thicker than even most thick PBT.
In this image we have Leopold FC900R which uses the same keycaps as Max Keyboard Blackbird.