Only if you replace the power supply unit. This is easy to do as it is an SFX form factor. You can also fix the biggest shortcoming of the product: The O power supply does not have silent mode. So when you plug in the Thunderbolt to the laptop, the fans of the power supply run. Even if the laptop is not switched on.

Most graphics cards sold with a 16-pin connector come with a 2 or 3 6+2 to 16-pin adapter. So yes, it is possible, but beware of the number of 6+2 adapters needed. Up to the super Rtx 4070 you need two, the 4080/90 requires 3. I don't know about the super Rtx 4070. The razer box offers two 6+2.