I still have to say that IMO the "is Arline Kercher dead" issue is not definitively settled.
Firstly, I find it hard to imagine that anyone - TJMK nutters included - would report such specific aspects as the date of her death and the fact that she's buried next to Meredith.
Secondly, and with specific regard to those TJMK nutters, it's not as if this matter has any relevance at all to their central thesis that Knox and Sollecito were involved in Kercher's death (whereas I could much more see someone there inventing (for example) something related to evidence in the case). So I just don't see any upside for anyone there to lie about Arline's death. And even now (and thankfully), nobody over there appears to be claiming that Arline's death might in any way be linked to Knox and Sollecito having "got away with it".
And thirdly, I don't think that the TJMK claim about Arline Kercher's death has yet been reliably falsified. I simply don't think, for example, that somebody working at Croydon Cemetery can necessarily be relied upon to state definitively whether or not Arline is buried alongside Meredith. And I also don't think that the absence of Arline's name on probate records is - at this point in time - any kind of proof that she hasn't died: those records can often lag considerably.
For me, the only way of falsifying (or proving) this claim reliably and accurately at this time would be to physically visit Croydon Cemetery and go to Meredith's grave side: either Arline will not be buried there (which will obviously falsify that part of the claim at least, but even this will not reliably falsify the claim that she died), or Arline will have been buried there.
Personally, I have very little interest in this topic - other than of course feeling sorrow at Arline's death (if the claim is true) - so there's zero chance that I'll be going across London to visit the cemetery. On the other hand, I would have thought it far from unlikely that someone affiliated to TJMK (perhaps one of their huge cadre of European lawyers and other experts.....) will go to visit the cemetery. I guess we may find out for sure that way.