Did you even read the link?
Were you told by a friend of your sisters boyfriends cousin that is was ok?
Its not about the particular product you use to remove the pests, its about the application, storage and safety of the products if you have a business that offers pests control even if you use chemicals you can purchase from woolies then you are breaking the law if you do so without completing the required course’s.
Honestly it has been this way in Australia since when I started back in 94, I bought a carpet cleaning business a few years ago( got rid of since) the guy also offered pest control he was not licensed he claimed if he bought the Mortien stuff from woolies that you spray outdoors it was ok, then he gave me a wink, he knew it wasn’t but was only doing the occasional residential job ad not advertising he did it, so he was never caught. doing high rise stuff in a city its just a matter of time.
I would suggest you read the link as it is for Victoria as that is where you live right?
I live in Queensland but its the same across the country