Greetings community,
I’m once more in need of your assistance as I’ve again lost access to my dataset.
Before touching anything else I’ve decided to come to you for your help in hopes to undo and recover 
I attempted adding my RTX5000 QUadro to my ROME8D2T however upon booting i discovered that the PCI ID had shifted for 1 of my HBAs (the LSI 9300-8E) which is connected to my 6 HDDs in 1 vdev of RAIDZ2
the original setup:
Once the GPU was connected (in PCI3) the HBA was listed as c4 and c6.
So i tried swapping to these to boot my TrueNAS VM but open booting TrueNAS i now lost my dataset.
So here is my quest:
Add GPU and restore the dataset.
Concerns are that touching too much in truenas will (as last time) corrupt the dataset.
Reward is my eternal thanks and lesson to a noob in dataset restoration 