I was able to get it to boot by changing it from RAID mode to AHCI mode (thanks to a YouTube video).  My drive is a 4 TB WD SN850X.  So, yes, I can confirm that that particular 4 TB drive works in the 7530. Of course you don't get Gen4 speeds but a Gen4 drive is backwards compatible and everything is going to Gen4.  So might as well get the Gen4 so you can use it in something else in the future.
I recently got a 4 TB NVMe drive (WD SN850x) to use in my 7530 and the machine will not boot with it installed. I see this questions asked elsewhere in this forum and the answer seems to be "should work" but I can't find confirmation of anyone actually making it work. Has anyone done so?  If so, what brand/model did you use? Thanks, rgames
Has anyone successfully used a 4 TB NVMe SSD with a 7530?