This is either a backtrack or miscommunication on their behalf, but I contacted them directly (being one those to buy a product from them on black friday before this announcement). Their initial response to me was 'We sure support the product sir, we just do not do any further development on it. We also assume it will be compatible with the new P3D, we just have not tested it.'
I followed this up with: 'Just to be clear, there will be no further development in terms of adding new features, but the existing product will be made compatible with V5.3?'
To which they responded 'Correct Sir.'
So it seems they are continuing to support the products and it will be made V5.3 compatible, but they won't be 'developing' it further in terms of adding new features. Hope this clears things up a bit!