There's no Sensah hydraulic groupset for sale yet (to my knowledge) so you should be safe to get just about any Sensah parts you're interested in!

You can also check out the official Ltwoo store: https://www.aliexpress.com/store/1101522220?spm
You can see the mechanical groupsets right at the top of the home page The hydraulic ones are pretty easy to weed out by price alone.

I haven't done much km's on the bike but have done a 90km (flat) ride sunday.

The bike performs good and I don't really have complaints. I find the ride to be a little to harsh though. I think the frame and the handlebars are a lot stiffer than my previous TFSA frame (Wheels and tires are the same). I actually preferred the TFSA frame for the comfort. In a weird way I even like the look of the TFSA frame better (I have it on my indoor trainer now). The Hygge frame looks great, but I like the simple look of the TFSA (Tarmac SL6 clone).

I also still have heel strikes on the chainstays with this frame, even with the 5mm longer pedal axles, 1mm extra pedal spacer and I adjusted my cleats to have my heels further outward (not great for my knees I think).
I also regret getting a frame that has no 0-setback seatpost option... None of the carbon saddles have rails that are far enough to the back for them to fit for me.

So there is nothing wrong with the frame, but if I would have to choose again now, I think I would order the TFSA SL7 clone or the identical Delihea Tank Machine. Prices are about the same as the Hygge Model S and Delihea has some nice simple paint schemes.