Hi Gareth, Steve.
Unfortunately, we as a club don't have any influence with tyre manufacturers, let alone vehicle manufacturers and as such pretty much zero authority in a case of warranty or product recall.
The posts obviously highlight a trend with poor quality tyres (although having said that I run Dunlop tyres on my motorbike and my BMW Z3 and have no issues whatsoever over the years and trust the grip implicitly). Although I have seen this on a few different occasions and each were on different tyre brands (Metzeler comes to mind where the whole casing split around the sidewall but this was definitely down to age and inactivity).
However, there are bad batches of tyres that come through into the market, Pirelli had an issue with their P4 tyre which actually stripped the whole tread from the casing where it wasn't bonded properly. The most worrying trend is Chinese manufactured tyres ("ditch-finders" as they are affectionately known) being actively sold through major tyre retailers and these are lethal, having zero grip, going out of shape, and extremely noisy.
In the case of the Dunlop tyres splitting, I could only recommend the check the condition and manufacture date and take it directly to the tyre companies that supplied them (if fitted since new) or if occurring on an new Audi then to take it back to the supplying dealership.
Again, it is worth checking the country of manufacture and any batch numbers to see if there is any common theme here.
If we can categorically find a recurring theme then it would be worth collating the information to forward to the relevant tyre manufacturer to raise awareness of the issue.