Severability of provisions pertaining to billboards and other prohibited signs and sign types. Without diminishing or limiting in any way the declaration of severability set forth above or elsewhere in this article, this chapter or in any adopting ordinance, if any part, section, subsection, paragraph, subparagraph, sentence, phrase, clause, term or word of this article or any other law is declared or held to be unconstitutional or invalid by any court of competent jurisdiction, such declaration or holding shall not affect any other part, section, subsection, paragraph, subparagraph, sentence, phrase, clause, term or word of this article that pertains to prohibited signs, including, specifically, the prohibition on billboards and those signs and sign types prohibited and not allowed under § 148-114 of this article.