Seagate firecuda 4tb m2 vanished ?

[digitaldreams]

Looking to upgrade my sons 2tb Seagate firecuda to a 4tb without heatsink and it seems to have vanished from many shops including OC ??

 

[5abr3]

To me it looks like the 530 is reaching end of life to be replaced by the 540 but 4TB 540's are still to be announced. So my guess (emphasis on this as I can't find evidence to back this up particularly) is there's a gap in production at that capacity