After backtracking and double checking, I found my mistake.
I needed to download and apply the aarch version of nomachine.
uname -a gave me the following:
Linux goldenpi 5.15.32-v8+ #1538 SMP PREEMPT Thu Mar 31 19:40:39 BST 2022 aarch64 GNU/Linux
So aarch64 was the clue that led me to NoMachine for Raspberry ARMv8 DEB
Hope that helps someone else.