No.

There are two versions of the phone: One with 128GB/6GB and one with 128GB/8GB. This would be the 6GB Ram model.

Yes, all Google services are still available and an update to Android 10 is also possible.

This should not be a problem with the right applications. "To use the Galaxy Watch on your Samsung phone, all you need to do is download and install the Galaxy Wearable app from the Google Play Store, also known as Samsung Gear. The application provides all the information about the watch and also acts as an advanced manager that personalises the functions of the accessory. However, if you install the Galaxy Wearable application on a Huawei smartphone, you will need to install an additional Galaxy Watch Plugin application. Thanks to the second application, your smartphone can easily synchronise the data with the accessory and provide, for example, information from the calendar or the exact location. After installing the Galaxy Watch Plugin, your Samsung Smart Watch will work on your Huawei phone as effectively as on any Samsung smartphone." Source: https://www.etuo.de/blog/sind-huawei-handys-mit-den-samsung-uhren-kompatibel/2424

No, it isn't.

Does it still have Google services? Yes And when using 2 SIM cards, can the second SIM card also work in 3g/4g simultaneously with the first? Yes

No: without cover, without screen protector. It comes with an adapter for the earbuds with jack adapter. I ordered the case elsewhere (apfelkiste).

It is the latter: Yale-L61A.

I don't know, but I don't think so. I bought a case from esons.ch, which also sells leather cases. It was a great service, the case was here one day after I ordered it. Greetings, Stefan

This was indeed a mistake, it will be changed as soon as possible. It is indeed a 6gb model.

Yes :)