Don’t blame the Strata Manager (he is more accurately called a Strata Administrator) as he works for the strata and takes instructions from the committee and the OC. He generally he has NO power to take unilateral action unless instructed to do so by EC or OC.
If the committee won’t vote to act because of self interest then get the OC to pass a motion to act (this overides any EC decision).
Good luck with getting the council to act as I’ve no idea if it will work.