Section 139 (2) of theAct says this:
By-law cannot prevent dealing relating to lot
No by-law is capable of operating to prohibit or restrict the devolution of a lot or a transfer, lease, mortgage or other dealing relating to a lot.
I would think that means if the DA says it’s residential then the strata scheme can’t change it to non-residential. But I do know of buildings that were approved as short-tem lets only and the owners had to move out when it was discovered they were living there.