Edit: I have no experience with this seller, but here are the links:
Internal routing through headset: https://www.alibaba.com/product-detail/2023-Lightest-Weight-650g-same-to_1600860750115.html?spm=a2700.shop_plgr.41413.3.39582af1cVmqH2
Internal routing through downtube: https://www.alibaba.com/product-detail/2023-Lightest-Weight-690g-same-to_1600861204788.html?spm=a2700.shop_plgr.41413.7.39582af1cVmqH2

Really interesting frames as well.
I tried to do some digging on them. What I noticed is that the seller also offers an Epic Evo fullsuspension copy. Two friends of mine also got really lightweight Epic fullsuspension frames through "allstarbicycle.com" where a couple of guys I know had purchased SL7 and Epic hardtail copies with no problems at all for a few years now.
The Epic FS geo cad table illustration, some pictures and the font on allstarbicycle.com are exactly the same as for the Epic frame from the seller you linked.
Now unfortunately the Epic fullsuspension frames which my friends probably bought from the same seller/factory unfortunately cracked at the BB and chainstay after very few rides. While they are receiving replacements and people have been happy with other frames from that website, I guess I would be careful about the super lightweight stuff from them.
Some pictures of the failures and comparison screenshots of the alibaba seller/allstarbicycle.com attached.

the Geo date, and carbon wheel/ carbon handlebar for choosing,

Is it possible to get a total weight for
- frame (preferably size large)
- motor
- battery
- all electronics needed to finish the build

Thanks in advance!

By total coincidence I just found out that a local brand seems to be selling the wcb-r-306 as their high end aero road bike: Baldiso Airflight One https://www.baldiso.com/airflight1

...at least it looks strikingly similar...

nope, unfortunately they never replied...
I did actually go ahead and order this handlebar/stem combo which seems to be identical to the "The One Pro" handlebar:
https://www.alibaba.com/product-detail/T1000-Carbon-Bike-Handlebar-Fully-Internal_1600457733782.html?spm=a2756.order-detail-ta-bn-b.0.0.40a92fc2xp6RAa

Thanks for the super helpful reply. By purple blue you mean no11 or no16?

Your frame has no problem just keep riding it. All my mountainbikes have marks like this eveywhere after some time.

Wow, seems like there actually are plenty of bars to choose from, thanks for the input. I had the idea to check Yishun where I once ordered some rims and it actually looks like they manufacture the "The One" handlebars...? I think I am going to try the HB058.

https://www.yishunbike.com/product-category/components/components-frames/components-frames-handle-bars/road-bars/

Their HB088 also looks suspiciously similar to the "The One Pro 2022" handlebar/stem combo. While not exactly the same (steerer clamping, topcap interface), there are lots of elements like the cable routing area under the stem and the chamfer along the tops that are identical.