This rule is way too strict without any real reason.
Any CDI container must support that both methods are being called on the same event payload anyway. Because we did not forbid that observerMethod1 invokes setAnnotatedType and observerMethod2 uses configureAnnoatedType. And that's good that way, otherwise the pluggability would be lost.
We should delete this sentence without any substitution.
The same applies to similar configurator methods like configureBeanAttributes, etc.