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I can't remember where I saw it (whether FW email response or some FAQ) but I know they clarified the Laser Destroyer or Laser Destroyer Array as AP1.

Vindi Tank Destroyer is different and more like the Neutron Laser.

Edit - scratch my last sentence.

Ok apparently LD or LDA was originally 36" AP2, and there was a FAQ on such. Then in newer books they changed it to AP1 and there was a FW response saying it was now all AP1. It DOES seem like the latest Vindicator IS also an LDA but as you correctly observed, it is now 48". So still don't know if they are retroactively making all LDAs 48".