Yesterday, I visited Dell driver download page and noticed these bizzare things
This is not my first time doing clean install of Windows 10. I've done this many times and I have never encountered such problem. Is it intended or something wrong about Dell website?
Laptops rarely if ever get driver updates. Why were you trying to update drivers? You should already have all the win 10 drivers since you installed it before. A Clean Install doesn't change the drivers. Use the scanner on the download page to see what drivers-if any-you need OR Check Device Manager to see if you need any drivers. If everything is working OK, you don't need any diff drivers.
I've just reinstalled my Windows 10 for some akward reason (it hard to explain). That's why I need drivers. Now I'm left with uncomplete driver on my laptop.
Use Dell Update, it will scan your system hardware IDs and check the installed driver versions. If it finds a device which has a newer driver on the Dell server it will install it for you: