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It means they are lying to you in order to control you and do bad things to you. Either that, or they are withholding information from you for the same reason, or they are intentionally causing the situation for the same reason. The notion that less energy puts more demand on power lines than more energy is nuts. There may be some edge case technical issues they're intentionally causing that are exceptions. The fact they give you a vague answer should be all the information you need to realize they're lying in order to hurt you.
...I spoke to Western Power and the form had been filled in wrongly - the company said I wanted to add more solar NOT add a battery - fools!! Correct form now in