Cut in (plate) tires – repairable?

Hello, Before I go to the workshop on Monday morning (I’m in Sweden), I wanted to ask you if you can see that the tyre has to be replaced (see picture). Am I pessimistic, but maybe I’m wrong)? I didn’t measure it specifically, but from the outside the cut looks like 8-10mm. The 6mm rule also applies here – but also for straight cuts? The spare wheel has hit on it. To the next workshop it is 30km, after home e are then 200km again, everything a little stupid. Thanks for your answers already!