i there,
Sorry for the late reply, I was on vacation too 
.
I was able to follow the original SDK wiki and perform ALL the steps using the nRF54L15DK board as the target first. Works AOK. I do think some steps may be reversed and why wouldn’t it. 
I’m using the VS Code with NRF_SDK 3.1.0 extension
I was able to build the same for the Xiao nRF54L and it also works.
my issue’s were more of the keyboard and the floor variety when installing the OpenOcd for the Seeed Debugger. I had to go back and recheck the boards portion to get it to show up correctly. I will make a Video Documenting all of it. ASAP 
Is your zephyr install updated?
Did you install the Nrf_connect SDK?
forgive the 20 questions, I’ll be catching up and reading what was posted in the meantime.
are you getting this in the NRF_SDK?
HTH
GL 
PJ
I haven’t tried the PLIO and the Zephyr raw dogging it wiki, but I will and report back. great to have this Hardware finally but as per seeed usual the software WILL need more polish, it will take time and I’m hopeful but would be good if some Arduino IDE could throw some love at it in time too…