No – it is that simple.
If he is appointed as a substitute member* then he can vote but as an advisor to the EC he has no vote.
* SSMA
Shedule 3 Constitution of the Executive committee
3 Acting members of the executive committee
(1) A member of the executive committee may, with the consent of the executive committee, appoint an owner or company nominee of a corporation which is an owner to act in his or her place as a member at any meeting of the executive committee.
(2) The owner or company nominee so appointed is, while so acting as a member, taken to be a member.
(3) An owner or company nominee of a corporation may be so appointed whether or not he or she is a member of the executive committee already.
(4) If a person so appointed is a member of the executive committee the person may, at any meeting of the executive committee, separately vote in the person’s capacity as such a member and on behalf of the member in whose place the person has been appointed to act.