How does the CRediT system work?
Journals use a variety of formats for reporting author contributions. This content is like a conflict of interest statement—it's not typically evaluated as part of the peer review, but more a contractual reassurance in case of later concerns such as whether an author is added with no contribution.
I've used CRediT statements in several published papers. I don't know a citation for my claims below, but I strongly suspect:

Yes
Not mutually exclusive