Samsung annoyingly makes many variants of their devices; in the past, even phones with the same name would have completely different CPUs. So, be sure you have a5xelte and not something else.
I did see this on the top of the wiki page:
This device has been archived. This means that it no longer appears in pmbootstrap and is likely broken.
It can still be selected inpmbootstrap initby typing in the vendor and codename, but you will have to build the kernel package manually.
Do you have Heimdall installed on Linux PC? The instructions say to get in Odin "Download Mode" and then use Heimdall to flash TWRP into the recovery slot.