Apparently, Nvidia underestimated the impact of AMD's 7 nm GPUs and is now looking to phase out the upcoming Ampere GPUs faster, as the green team has already pre-booked an important part of TSMC's 5 nm production capacity for 2021, when the Hopper GPUs are expected to hit the market.
https://www.notebookcheck.net/DigiTimes-report-suggests-the-Nvidia-Ampere-GPUs-launching-in-late-2020-may-be-replaced-by-5-nm-Hopper-GPUs-one-year-later.464133.0.html