Go to page one of this discussion and you can see what the exact regs are. It discusses what emergent vegetaion is and what is and what is not allowed.
I'd say that regs as presented in the first post are very clear about what is NOT emergent vegetation (i.e., dead trees or stumps), but not clear at all about what IS emergent vegetation. And, depending on how you diagram or parse this sentence
In this sub-section, "naturally occurring growth of emergent vegetation" does not include naturally occurring dead stumps or trees or vegetation placed in the bottom by a person.
LIVE trees may or may not be emergent vegetation according to the rule, although the explanatory photographs certainly suggest that live trees are not considered emergent vegetation, at least in the examples provided. However, based on the rule as written, the adjective "dead" would appear to apply to BOTH trees and stumps, since the second time the phrase is used, the order is reversed and it reads "dead trees or stumps".
From which I conclude that "dead" is important, and which says nothing whatsoever about emergent live trees.
Rule #1--if it takes multiple photos to explain how a rule or law will be interpreted, then the rule is not clearly written.
All of which begs the question of why the wildlife agency would "clarify" a rule about hunting in open water--the stated intent of which is to allow ducks refuge in open water portions of lakes--with examples of "violations" along the shoreline.
Bottom line: whether you think this is a good rule or a bad one, it's poorly written and open to interpretation by a judge or jury. That's the last thing a CO wants if he or she ends up taking a contested case to court.