The Rental carbon version is not mentioned in the test, so no need to panic
The essence of the test can be found in the two diagrams in the upper part of the 3rd page and can be understood w/o knowledge of german language: no. of cycles required for a bar to fail and weight of the bar/stem combo (they were always testing two samples of each bar). On the bottom of the page the different loads applied during the test are shown (force pushing/pulling on the bar, frequency, no. of cycles). And it seems they put brakes, shifters and lock-on grips on the bars - fastened with the specified torque. Btw., both Syntace carbon bars were stopped after 1.000.000 cycles w/o failure.
However, it is mentioned somewhere in the text that this test and similar tests in other magazines indicate that the production spread for carbon bars in general seems to be significantly larger than for conventional aluminum bars, possibly due to the largely manual processing of carbon vs. fully automated manufacturing of aluminum bars.
But clearly, such tests need to be taken with a grain of salt. Testing is performed under perfect lab conditions with force always applied in the same direction. So I am not sure how representative this is for real world use, where forces are coming from multiple directions, stems/brakes/shifters etc. are not necessarily always fastened with the correct torque, additional stress from crashes, scratches etc.,...