I just removed softDelete from a table with this migration:
Schema::table(\"items\", function ($table) { $table->dropSoftDeletes(); });
You also need to remove the trait from the model:
use SoftDeletes;
From the docs:
To enable soft deletes for a model, use the Illuminate\Database\Eloquent\SoftDeletes trait on the model
Illuminate\Database\Eloquent\SoftDeletes