Yep, synthetic composites can produce better structural properties than their pure metal counterparts. Still that doesn't mean that companies are actually using the better components. Also of note here is that better tensile/compressive strength doesn't help you if you actually want a deforming device so all the aforementioned composites are invalid as far as the deformability claims go since they would deform worse than Aluminium.
Also of note is that the point in doing material research for some projects is to create a better product while for most projects it just is to make components cheaper.
I had done some research on the quality of the plastics going into laptop cases in early 2004 and found that among all the made to price devices only the Sony Vaio line had some quality concerns in their compound design reciepes and if you look at laptops from that era the only thing you will see is a faded mess. Seriously the only plastic device I have seen fade nicely is the Nokia N9 and on that one the test is still going.