The 'Performance Tuning Guidelines for Low Latency Response on AMD EPYC-Based Servers Application Note' (Revision 3.01, June 2018) paper reads on page 17:
rcunocbs=<core list>—Restricts these cores from receiving any rcu call backs.
That option is actually named: rcu_nocbs
Since nohz_full (which is also listed) does imply rcu_nocbs, you still get the intended effect.
But it still makes sense to fix this and perhaps clarify that this option is redundant when using nohz_full.
Btw, the guide contains many figures with code/command snippets that are rendered as images - such that one can't copy and paste them into a terminal. Which is unfortunate.