Well not sure if this could be foreseen when Rainemak was writing this, but there is no need to argue here that - and I am saying this without knowing if really the Android 14 blobs are the culprit here - it would have definitely made sense to rethink this choice meanwhile.
On the other hand I can imagine that a lot of work has been done already for 14 and I can understand that they want to avoid the “double” work necessary maybe to make 13 main target again.
However, that again makes me wonder why the focus on the Sony devices anyway- there are surely a few other companies and models out there which definitely would come to mind, such as the Gigasets which Volla uses for their Vollaphone (and for which there are already some community ports - while I am not sure in which state they are) or Fairphone which should be open for such ideas as well, just to name a few.
But in the end this brings me down only again to the same conclusion, they don’t seem to have the capacity for any of these as well as some serious progress on the Xperia series- and this brings me yet again to the conclusion that there something goes really really wrong here.
I mean, there is good working OS, stable and functional in general with pretty much all essential needs covered. There are obviously people willing to wait months if not years while also accepting to have old outdated hardware and still it doesn’t seem to be possible to have a very decent range of devices, which would make this entire project also a LOT more attractive for - excuse me - “normal people” 
But nothing happens, it rather looks like everything is done to let it die.
Really, I don’t get it, actually, I’m more than frustrated.