It's probably worth putting out a PSA on the difference between DI motors and MPI motors. I think some people know and are catching on, but some still don't.
If the motor is a modern (post-2016) 5.3L or 6.2L it is a Gen 5 DI motor. Direct injection. This is the latest generation of GM small blocks and features high compression (11:1), extremely high fuel pressure (~2100PSI), variable valve timing, all aluminum block and heads. These motors are lightweight, smooth, very responsive, and fuel efficient. Fuel is sprayed directly into the cylinder at the top of the compression stroke. Nautique came out with these initially in 2016. Other manufacturers followed a few years after.
Malibu got these a couple years ago, and MC offers them, they took a while on the 5.3 but I see it in the catalog at least.
Malibus are 1:1 transmissions, Nautique and MC are reduction transmissions.
The 6.0 is MPI, Multi-port Injection (previous generation technology), where the fuel is mixed within the intake manifold vs. being sprayed directly into the combustion chamber.