There's a lot to cover. Why are they advertising "1x13", what does this imply? Are they making a "full" groupset with cassette discs and cranks? Are they locking us into 13 speed now?
The crankset looks like the senicx PR4 but it's not, the back of the cranks is different. Calipers are not the zrace ones and I don't recognize the rotors. The pic is blurry but it looks like the levers are exactly the same

Inspired by sharks? The chinese are now doing meaningless bullshit marketing, they are learning so fast!
Is it 1x only?  No word on clearance or capacity, would be nice if you could purchase the gravel RD with road levers and FD and run something like 50-34 11-42

You MAY be able to reuse barbs and olive if you can get it out and if you haven't tightened the olive too much but it's heavily recommended to cut and put new barb/olive as you likely lose some seal. This is why you are often advised to leave as much hose as possible in the bike. If crimped properly the olive shouldn't come off anyway
You can pick up a pack of olive/barb/hose kits for 4 bucks on ali, or for 30 at your LBS who will urge you not to get them from aliexpress as they might explode. The olives are universal afaik but the barbs and hoses are not, i think the standard Ltwoo uses is BH59, same as shimano road
You seal the open hoses with a toothpick
And yes both ends of the hose have a barb and an olive

Hello,
I realized yesterday, watching TraceVelo video about bike rack, he is testing the eRx blue edition. Were checking videos and shorts (to know from when) but he did not mention anything about it. He will want to make a good evaluation before giving an opinion.
Greetings!!

His is eRX "blue" "v1". A revision but not the latest Joe showed with usb c

PM Cranks are mechanically speaking an inferior design to spider PMs. For spider PMs they are build with a pair of sheer gauges that can naturally filter out components of applied torque that are not due to rider pedaling, while crank based PMs rely heavily on post-processing to clean the data to a usable level. You also only need one side to measure true L/R combined power (though the power decomposition to L/R is still more or less guess work), which is especially good if you have a pretty big L/R difference (For me it's 56/44, so a left-side-only setup would overestimate my power by quite a lot)

I just really want directmount chainrings

After ride number 5 where the shifters stopped working, I have finally reached the point of permanently moving forward. Is there a way to use parts (such as the breaking calipers) in a shimano groupset?

Yes, the brake calipers use BH59 and mineral oil same as shimano, you can use them with shimano shifters
The battery, derailleurs and shifters however you can't reuse, they are a package deal

I have a ~2mm gap I don't understand and can't fix that didn't use to be there. This is from a carbonda 696 with the supplied headset, barely ridden only about 50km worth of shakedown rides
The lower split crown race don't sit flush with the lower headset bearing no matter what I do, I can't press it with my hands, tightening the steerer plug does nothing and there is no excess grease
I've tried fully omitting the split crown race like some people report but it steers like shit. But the gap disappears which confirms this is the culprit
Unless I'm crazy I think they used to sit flush and are supposed to