We could argue the legalities of this situation in and out but the realities of strata living are you can do whatever you want until someone objects to it. There are no StrataKops patrolling buildings in search of miscreants on whom to slap Notices To Comply (more’s the pity).
A landlord can reasonably expect to have some minimal level of access to their buildings (although there are regulations about how and when they can inspect their units) and turning up once a year to watch the fireworks is unlikely to cause a problem … unless someone takes exception to it.
Personally, I’d be in favour of landlords actually visiting their buildings now and again, whatever the pretext, because that is maintaining some direct communication that rental agents don’t always want.
Don’t abuse the privilege – and treat it as a privilege rather than a right – and i can’t see any problem.