My best guess right now is that this model isn't really available yet, because of shortage issues.

The official model datasheet clearly states that this model has up to 1 TB storage.
It also states that dGPU can be up to a 3050 Ti, and that RAM is 6400 MHz.
And yet currently on the website the 3050 Ti isn't available, and the RAM is only 4800 MHz.

Here's a datasheet excerpt:

SPECIFICATIONS:
Yoga Slim 7 Pro 16ARH7*

PERFORMANCE:
Processor
- AMD Ryzen™ 7 6800HS Creator Edition
- AMD Ryzen™ 5 6600HS Creator Edition
Operating System
- Windows 11
Graphics
- DIS : NVIDIA® GeForce RTX™ 3050Ti
- DIS : NVIDIA® GeForce RTX™ 3050
- UMA : Integrated Radeon™ Graphics
Memory
- LPDDR5 : 16 GB / 32 GB; 6400 MHz, Dual Channel
Storage
- SSD PCIe Gen4 M.2 2280 : 512 GB / 1 TB
Camera & Microphone
- FHD Webcam
IR Camera
Dual Microphones
Audio
- 2 x 2W Speakers
- Dolby Atmos® Audio
Battery1 (75WHr)
MobileMark® 2018 : Up to 12 Hours (TBD)
Local Video Playback : Up to 15 Hours (TBD)
Rapid Charge Boost : 15 min. / 2 Hours Usage2

DESIGN:
Display
- 16" 2.5K (2560 x 1600) Touch IPS, 500 nits,
100% sRGB, 165Hz, 16:10, Dolby Vision®,
TÜV Low Blue Light Certification
Dimensions (W x D x H)
- (mm) : 356 x 245.9 x as thin as 17.4
- (inches) : 14.01" x 9.68" x as thin as 0.69"
Weight
- Starting at 2.1 kg (4.6 lbs) (TBD)
Hinge
- 150°
Color
- Storm Grey

... oops, sorry ! Not the exact same model ! DAMNIT LENOVO !!!

I understand that :) However, it seems that this same laptop is being sold with 1 TB SSD in the US : lenovo dot com /us/en/p/laptops/ideapad/ideapad-500/ideapad-5-pro-gen-7-(16-inch-amd)/len101i0049

This is strategy: always offer products with flaws so that they do not become too good. Rather save a few pennies (or add crapware and craplabels) to earn more per sold item. It is beyond the manufacturers' imagination that, in all respects, good products would generate more income.

Hi. I'm interested in this laptop, but surprisingly in Lenovo's website 512 GB SSD seems to be the only option. No 1 TB possible, unlike most other Lenovo laptops. This is really weird since this is supposed to be a mobile workstation with Rembrandt "H" CPUs.

You can check it here: lenovo dot com /fr/fr/laptops/yoga/yoga-slim-series/Yoga-Slim-7-Pro-Gen-7-16%E2%80%B3-AMD/p/82UWCTO1WWFRFR0/customize?

Is this a bug? Can this laptop be ordered with a 1 TB SSD?Thank you.