This sounds about right and is pretty standard when dealing with a lot of companies nowadays. Consumers buying products/services from a company have different rights than a business buying products/services from a company.
In my own personal opinion, which goes against the above description, all landlords are effectively “in business” and are therefore exempt from consumer rights. You are taking money in from your tenant (income) and paying out for maintenance, insurance, etc. (expenses) and are left with a profit or loss at the end – whether you are an accidental landlord or not, you are running a form of business.
I wouldn’t see it as a customer service issue, just that you will receive less rights as a commercial/business customer over a consumer customer. This association have spelt it out but the same would probably apply with other associations.