Does PCI bifurcation work with an NVME riser PCI card with a controller?

I have a B450 MSI Pro Carbon AC and has two built in NVME M.2. However the second one runs at PCI 2.0 8x. Which is half of the rated 3200 mb/s.

Would moving both to an NVME controller with an 8x slot below my GPU run at full speed?