They're actually not carbon fibre, they just look like it.
As every one of your posts made has a link to your own YouTube channel I wonder if this is simply self promotion for your own benefit
I was wondering the same. At a stab, I'd guess Car_Losg (or a 'friend') has a business (XS Automobiles & Motorcycles Store?) that sells these XiangShang struts on ALiExpress.
I'm guessing it's the strut manufacturer (XiangShang) that is saying::
..........
Gotta say, that extendable squeegee-head tool used in the video to hold open an unsupported tailgate is a handy idea especially if both struts are stuffed. Many households would already have one of these that us DIY-mechanics could 'borrow'.
I have downloaded several YouTube videos that Car_Losg linked to in his previous posts because I found them interesting and well presented...but I did edit out the 'ads' etc
.