Thanks to Babykim, EU

On the fate of ARP ships by developer kindly

It will not be possible to obtain the ARP ships after 2016, and the Yokosuka port will not be available in the client. All ships available to the player will remain in port, selectable using a carrousel filter. The filter will function as the Yokosuka port, i.e. selecting would allow the player seeing the ARP camouflage and effects in port as well as in battle, unselecting the filter will hide the ships in port and give them historical appearance in battle.

I am sorry if this is well-known (posted on 16.11), but I have missed it.