Many seem to think "format" just means "get a disk ready for use" (whatever that vague idea means).
"Format" actually has a very specific meaning, which is very important when using Unraid.
Format is a write operation that means "write an empty filesystem" to the disk. Many people have lost data from not understanding this simple meaning. When they are replacing a disk, they think then need to format it before rebuilding. If you format a disk in the array, Unraid treats this write operation just as it does any other, by updating parity. So, after formatting a disk in the array, the only thing that can be rebuilt is an empty filesystem.
Parity swap is the correct procedure to replace a disk while also upsizing parity. Would be better if you followed the instructions exactly.
If you want to do the preclear test on either disk, you should do it before anything else, with the disks as unassigned devices. Format has no place in any of this, it is either pointless, or dangerous.
Since disk1 is already disabled (and the emulated disk1 is mounted), you can skip the first 4 steps in the documented procedure.