I guess anything is possible. The artilce you linked to has no proof other than anecdotal observation at this point. The items that stand out in the article is it states "in direct contact" and "heavy growth". While these may be suspicious circumstances, it doesn't seem to be much more than a theory at this point. Worth consideration though non the less.
While macro algaes of every type can have adverse affects on coral health (primarily Caulerpaceae) it's one of those, all things in moderation type considerations.