Unless he his also an owner, section 32 (b) of the Act would forbid him from being elected.
32 Persons who are not eligible to be appointed or elected to strata committee
(1) The following persons are not eligible for appointment or election to a strata committee or to act as members of a strata committee unless they are also the owners of lots in the strata scheme—
(b) a person who acts as an agent for the leasing of a lot or lots in the strata scheme to tenants.
Regarding the strata roll you can ask the committee to tell him not to use it (although they have no power to prevent him). Perhaps they could threaten to advise owners that he is breaching privacy and that they should take care in their dealings with him.
But really, it’s up to individual owners to ignore or block his emails, which is very easy to do.
Perhaps an email from the committee to all owners saying the strata roll has been used without permission and that they can block emails from this person (and telling them how to do it) would dothe trick.