Directly Reducing Relative Clause When There Is an Adjective

Various sites state that a relative clause cannot be directly reduced when there is an adjective:

"The man who is angry is outside" cannot be "the man angry is outside." Instead it should be "the angry man is outside."

However, we see sentences like the below:

People angry about the latest political scandal are protesting outside.
Comments negative toward the candidate are being deleted without notice.

Q1. Are they grammatically/academically correct?

Q2. If so, is the rule about not being able to directly reduce a relative clause when there is an adjective only applies when there is ONLY an adjective by itself?

Thanks in advance.

(not a teacher)

Both sentences are correct, however, I'd only use the first sentence if I needed to make
it explicitly clear who I was talking about.

I find "comments negative toward the candidate" to be pretty awkward.

Okay so we are clear on the no reducing rule, meaning it only applies when there is only one adjective (or cannot stand when reduced).

Thanks everybody!