No, the product description specifies a 1TB PCIe NVMe SSD, but it does not mention Gen 4. It is likely PCIe Gen 3.

Questions & Answers: ASUS VivoBook Flip 14 Gaming and Entertainment Laptop-2-in-1 (AMD Ryzen 7 4700U 8-Core, 20GB RAM, 1TB PCIe SSD, 14.0" Touch Full HD (1920x1080), AMD Radeon Graphics, Active Pen, Win 10 Pro)

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ASUS VivoBook Flip 14 Gaming and Entertainment Laptop-2-in-1 (AMD Ryzen 7 4700U 8-Core, 20GB RAM, 1TB PCIe SSD, 14.0" Touch Full HD (1920x1080), AMD Radeon Graphics, Active Pen, Win 10 Pro)

4th Gen AMD Ryzen 7 4700U 2.0GHz Processor (upto 4.1 GHz, 4MB Cache, 8-Cores) ; AMD Radeon Graphics Integrated Graphics
20GB DDR4 SODIMM RAM; 802.11ac Wifi, Bluetooth 4.2, Integrated Webcam, Fingerprint Security System, Backlit Keyboard, Active Pen
14.0" Full HD (1920x1080) Touchscreen Display; 45W Power Supply, 3-Cell 42 WHr Battery; Black Color
1TB PCIe NVMe SSD; 1 USB 2.0, 1 HDMI, USB 3.2 Type-C Gen2, SD Reader, Headphone/Microphone Combo Jack.
Windows 10 Pro-64, 1 Year Manufacturer warranty from DealKing (Professionally upgraded by DealKing)

$799^.99 –