The video mixes legitimate NVIDIA app settings with exaggerated claims about universal FPS gains and stutter reduction.
Claim-by-claim breakdown
Accurate (92% confidence): The NVIDIA app has a Graphics tab with DLSS override settings, including a custom model preset option. Official NVIDIA support and GeForce news explain that users can go to Graphics > Global Settings and configure DLSS override / model presets, including Custom.
Accurate (90% confidence): For RTX 20/30 series GPUs, NVIDIA says DLSS Model K is the preferred choice for an optimal balance of performance and image quality. NVIDIA states that GeForce RTX 20 and 30 Series GPUs lack native FP8 support and should use Model K for an optimal balance of performance and image quality.
Accurate (69% confidence): Using DLSS preset M on RTX 40/50 series cards is the best performance choice. Official NVIDIA posts say Recommended sets Preset M for DLSS Performance mode on newer RTX GPUs. That supports the preset mapping, but not a universal 'best performance' claim.
Misleading (84% confidence): Setting Power management mode to Prefer maximum performance will give you the most FPS. NVIDIA support says 'Prefer maximum performance' can improve performance in certain applications when the GPU is throttling, which is narrower than the video's universal claim.
Unsupported (62% confidence): Disabling the NVIDIA overlay will reduce stutters and increase performance. I found official sources showing the NVIDIA overlay exists and can be disabled, but not strong evidence for a universal stutter/FPS improvement claim.