Although smaller, the colour and general shape certainly look like the Porrostoma beetles that are common at the moment, but the enormous 'horns' and the lifted legs spoil the illusion somewhat.
Yes, despite this mimicry, I have still seen large numberss of Silver Gulls hawking after and feeding on large numbers of flying Lycid beetles on warm afternoons in Canberra. So any mimicry benefit to the moth may be somewhat illusory.