First, there are only two major manufacturers of CPU, one is AMD and the other is INTEL.
Second, hard disks are two major brands, one is WD and the other is Seagate. (Hitachi is also WD's now. ) Toshiba has only a few laptop hard drives.
There are many manufacturers of memory, but Dell does not produce it, and there is no technology to produce it.
As for the graphics card you see, it's labeled Dell, but it's actually produced by AMD ... because the graphics cards are mainly from AMD and NVIDIA.
And the motherboard, marked Dell, is basically manufactured by Foxconn. ..
Not to mention the display, Dell basically let Samsung LG AOC OEM. ..
To sum up, the Dell brand machine you bought is genuine, but what actually belongs to Dell, probably only the shell has its own patent, and it is provided by Dell after sale. The others are similar to the assembly machine.
Of course, in Chinese mainland, the business of assembling notebooks is still relatively small.
Not just Dell, Lenovo, Sony and so on.