Oh yes. I don't know employment law in NZ, but in the UK if brothels were legal (indies are legal), then all these types of complaints would come under a worker's rights.
The Employer (brothels and pimps) would need to provide job descriptions, inductions, training, condoms and other PPE - these sex-employers will have to risk assess everything they're asking employed WGs to do. As well as give them maternity leave, pay their NI and pay their income tax. I would hope they're getting over the minimum wage already. They'll get statutory rights, max working hours, paid leave, a fair right not to get fired unreasonably etc. and all that other stuff we workers take for granted. Legal pimpparlours will have a legal duty of care to their employees.
I don't know how the mentally large places in Europe like Artemis manage all this, but any sensible UK legal employer of sexworkers would have to think very carefully about: "Right, what the hell do I do if one of my customers tries to rape one of my employees, and where the hell do I stand legally?"
Like Uber drivers, if you can't create your own products or negotiate your own prices, you should be an employee not a contractor. WGs that parlours can force to do the kind of awful shit that's in that article, should be employees, not contractors.
A lot of WGs will have to come off benefits too then, as once they have an employment contract they're our fellow respectably employed citizens now (as they should be).
So if employment law is enforced on a legal sex industry, these extra costs should force pimpparlours out of the market compared to indies. Sergie and some EE girls will simply move to the black market of course - if EE gangmasters are willing to have chinese cockle pickers drown on them, they're not going to think twice about using working girls in breach of UK employment law.