Sorry if I'm missing it but I can't find anywhere if there is a mode to "disable" the light and only flash once it detects a vehicle.
Battery life is kind of an issue for me and I don't see the point in flashing when there isn't anybody to be seen by.
Is there such a feature? Sounds like a nobrainer

It has that feature, its called single radar mode, under the light settings. Then theres a subsetting in that mode which will flash the lights on detection of a car.

I'm asking the seller some questions about the TT-X42, but he's not answering. I wonder if you can help me:
Is the cassette HG (Shimano) or XDR (Sram) freehub?
Do the hydraulic brakes come bled? Do they send a bleeder container?
Do the shifters come pre-adjusted?
Thanks

The cassette is hg, and the casette comes with a spacer on the freehub.

Brakes are bled, the only accessory is the charging cable and Allen key set.
The groupset has been adjusted, so it's ready to ride after assembly.

The frame is really quite dated, you'll be looking to replace the wheels eventually too. Tyre clearance is 32mm at a stretch, I run 28mm as the stock wheels are offset.

Can you explain what you mean by an outdated frame?

I see it like you do. From my perspective, the package is unbeatable in terms of price. I can't understand how the package can be offered so cheaply. I'm considering whether to buy the deal or not. What bothers me the most is the 42 handlebar. Due to the fully integrated cockpit, a replacement is probably not so easy, which is why it puts me off a bit. Actually, I don't need the bike, but the Wheeltop groupset would really tempt me. I’m watching the deals (spring, summer, back to school, etc.), maybe the price can even be pushed down to 1100€ (including shipping to Germany). If I buy it, I will report back...

For what it's worth, I ordered the plain black finish, and ended up at 1.101eur with shipping to Denmark, using a 60eur off coupon, few days ago. That's also including the DPD shipping where 25% VAT is included.

I'm in the same boat as you in terms of value-for-money. For Europe, I don't see how that can be beat doing a self-source build when VAT is added on top. See raisinberry's example. The kocevlo bars is priced at 60USD, but the price i see, because of VAT ends up at 74USD. Applying that to the entire build, it ends up being 1460USD instead.