[mothered]

Do you think the chance of the driver appearing back on my doorstep is high?

As with every DNA, there's always the possibility of the driver getting In contact, but It's Impossible to say for sure.

I have SEd something from a different company which also used DHL for shipping 2 months ago, could this affect the SE in any way?

If that was the only SE with DHL In that time frame, then there's no cause for concern.

Also most importantly, I am very skeptical of aliexpress's customer service. Would they actually have my back?

No company will have your back.

It's like saying: "Give me the scooter free of cost".

I'm not sure if I could afford to lose the price of the scooter, and am scared they will just say ''tracking shows delivered, so not our problem'' (which is unacceptable of course, but don't know what I can expect from a company half the world away)

It's very likely (If not a certainty) they'll open an Investigation and refer to GPS/tracking records.

That's the nature of the DNA, and It's up to you to put In the hard work by manipulating them accordingly.