There is no official confirmation by AMD with regards to Cezanne APUs in the desktop segment, yet their engineering samples are discovered on Ebay.
A Hong Kong-based seller, ‘hugohk,’ has listed the engineering sample of AMD Ryzen 7 5700G APU for 499 USD. The previously leaked 5700G processor and this engineering sample have the same AMD OPN code (100-000000263-30).
The listed APU is based on AMD Zen3 architecture and Cezanne silicon. It features 8 cores, 16 threads, and a boost clock speed of up to 4.45 GHz.
The seller has mentioned in the description that GPU drivers for the integrated Radeon Vega graphics were originally not available, and a discrete graphics card was required. The seller has received the drivers now, and whoever buys the APU will receive a fully working processor.
The seller also uploaded the same CPU-Z screenshot, which appeared in previous leaks. The seller claims that the data is from his buyers, which tells that all the leaks might have originated from the same source.