Adobe Premiere Pro 14.3.0 not Using AMD Vega 11 GPU

I have just seen a new result with your CPU and integrated GPU setup (albeit with a different motherboard, chipset and storage configuration). As it turned out, the extremely poor scores that I saw were with a lesser Ryzen 3 G-series APU and Vega 8 graphics. The one with the 2400G and Vega 11 graphics scored fairly respectably, with the biggest bottleneck being the export score (probably because that system had a slow HDD instead of an SSD for the projects/media/exports drive). Live playback score was typical for a 4-core/8-thread CPU that was three years old (the vintage that the original Zen architecture dated from). Your 2400G, despite being numbered in the 2000-series, actually used the first-generation Zen architecture of the Ryzen 1000-series CPUs. Similarly, the Ryzen 3000G series used the Zen+ architecture of the 2000-series CPUs rather than the Zen2 architecture of the non-G 3000-series CPUs.

I hope this helps you match the GPU to your CPU.

I am very sorry to tell you this, but Premiere Pro does not currently support decoding of H.264 or HEVC video with a discrete GPU or a non-Intel GPU. You will need VCN decoding support for that 2400G. Until Adobe implements that, you are currently stuck with software-only decoding.