Do the PSUs come with cables to connect to a GPU that only has 12+4 or would I need an adapter for that? I think that's what they were asking.
If not, there should be aftermarket options.
The HXi series does not come with an adapter in the box for the 12VHPWR connector (12+4). The GPU's (3090 Ti's and likely 40 series) will have a adapter in the box to use with multiple PCIe connectors to deliver the power. I am sure every PSU manufacture and aftermarket will have adapters as well. The tentacle monster adapter in the box is not pretty.