very nice bike and colors 

I'm a newbie checking out what frame to go for.
this frame is quite low stack even in 54 size is it not?
so, quite aggressive like a race oriented gravel bike?

size 54cm the stack is 598.6mm, the aero road bike in size 54cm, the stack is about 536-545mm.

i like it...wondering how top tube height will work out...i recognised the frsme design from Thier ebike model LCE971

Yes, it's the same design as LCE971, The rear triangle have some adjustment on the RC length, and the front triangle is adjusted to the shape of the MTB.
attached two photos, one is completed bike of LCE971, another is LCFS948 on designing,

I watched the small video where you move the "suspension" by hand.
It seems hard to move with a very very little flex.

I can't imagine that with the dampening rubber in place the rear moves a lot...
Is it sill a prototype because now it looks like on terrain we can't expect more than 1cm of suspension or more probably just vibration softening to the saddle?

it's only a small suspension, to offset the vibration of the frame to the body when riding, it is just some precision bearings, not the rearshock on the suspension MTB, the travel value is only 10mm.
If the travel value is too large, it will reduce the rigidity of the frame and affect the speed of the bicycle; now the travel just has no effect on the speed of the bike，
One customer compared it with BMC URS and found that the speed was not reduced at all, and it's more stability than BMC on downhill. completed bike come from our domestic partner whom is the bike dealer.

review from buyers!

some more photos

Agreed, the frame is way less appealing than the prototype. I would prefer the LCR0X in term of design.

the frame LCROX-D have too many bike brands and bike shops use it add their brand, it's a classic aero frame,
we need a new frame for long distance, More relaxed and non-aggressive geometry.

The seat tube, seat stays and seat post look so different in these photo compared to the ones on your Facebook page.

Doesn't look like the same frame...

The seat tube has been changed because the original seat post can not support strong enough.
The length between top tube and down tube is different because the sizes,
the frame in the Eurobike is only sample,
The production frame has some minor modifications, such as the shape of the top tube.
In addition, the angle of taking pictures will also cause the results to look different